What do you guys think is the best catback exhaust available for Cobalts?

I've been really impressed with the Hahn 3" Catback, but wondered if anyone had one they thought was better.

To be honest, I dont think anyone else has a catback exhaust available yet.

hahn has one for u guys

Anyone have opinions?

Anyone have opinions?

Hahn is the only place right now with an aftermarket exhaust specifically for our cars.

Hahn is the only place right now with an aftermarket exhaust specifically for our cars.

It isn't specifically for our cars...it is the same one they offered for the SS/SC...

This leads me to believe that the TC guys can get any aftermarket exhaust that is available for the SC.

It isn't specifically for our cars...it is the same one they offered for the SS/SC...

This leads me to believe that the TC guys can get any aftermarket exhaust that is available for the SC.
Which is the reason i'm looking at the slp exhaust from lmperformance.com

the 2 exhauts hahn offers for the t/c and s/c are different

SC and TC cars need different exhaust tuning to make the most of what they have. Sure a cat back for an SC car will work but you won't see the full potential of the the turbo.

the 2 exhauts hahn offers for the t/c and s/c are different

Wanna bet on that one?

Same systems... different flange.

Wanna bet on that one?

Same systems... different flange.

there still different then;)

there still different then;)

:lol:
Sure... that works...

Alright...well to settle this argument down...

What company do you think makes the best exhausts?

I haven't seen any that LOOK better than Hahn...anyone have an exhaust that you think is better?

Alright...well to settle this argument down...

What company do you think makes the best exhausts?

I haven't seen any that LOOK better than Hahn...anyone have an exhaust that you think is better?

If you havent seen or heard about any better than Hahns than why would you want a different one? Theirs is 3", stainless steel and sounds great. And it is relatively inexpensive.

If you havent seen or heard about any better than Hahns than why would you want a different one? Theirs is 3", stainless steel and sounds great. And it is relatively inexpensive.

I'm just trying to get any other opinions out there...

It isn't like you can tell a difference until it is purchased and on the car. I'm trying to see if anyone really likes there exhaust and wants to let me know that I should consider it.

I personally LOVE my Megan Racing Drift Spec exhaust. It's not raspy at all and has a deep tone to it. I do believe the flange is differant for the SS/TC though. if you can get the flange made for it this would be my reccomendation...

I personally LOVE my Megan Racing Drift Spec exhaust. It's not raspy at all and has a deep tone to it. I do believe the flange is differant for the SS/TC though. if you can get the flange made for it this would be my reccomendation...

I put a Megan Racing exhaust system on my Wifes Celica GTS when she had it. Loved the sound, loud, deep tone and nothing raspy about it.

On a side note, couldnt someone just get a custom exhaust made with whatever muffler they wanted? I know my local exhaust shop could do it for me for under $400, 3" from the catback with whatever muffler I want.

yup, plenty of exhaust shops will do custom work

Becareful going 3" if you don't have the motor to back it up. I wouldn't recommend it unless you are over at the very least 275 whp and 300whp would be more desireable. 2.5" or 2.75" wouldbe sufficient for most stock or lightly modded balts out there. You'll fuck up the pressure in your exhaust system if the pipe's too big for your motor...

I could have sworn that turbocharged cars ran better and put down more power with a 3" vs a 2.5" or anything else. Hows come Hahns exhaust for the SS/TC is 3"?

like I said personally I love my Megan Racing exhaust and after hearing it on my car if I would ever (hypothetically) switch to an SS/TC I wouldtake the megan racing exhaust and have a custom flange made to match the one for the SS/TC and use it. It sounds amazing and I've even had Honduh guys comment on how good it sounds...

I could have sworn that turbocharged cars ran better and put down more power with a 3" vs a 2.5" or anything else. Hows come Hahns exhaust for the SS/TC is 3"?

If I remember correctly their exhaust for the SS/SC is 3" too...

Becareful going 3" if you don't have the motor to back it up. I wouldn't recommend it unless you are over at the very least 275 whp and 300whp would be more desireable. 2.5" or 2.75" wouldbe sufficient for most stock or lightly modded balts out there. You'll fuck up the pressure in your exhaust system if the pipe's too big for your motor...

The Hahn says their 3" Catback is ideal for cars with 250+ HP. That means it is perfect for a stock SS/TC.

like I said personally I love my Megan Racing exhaust and after hearing it on my car if I would ever (hypothetically) switch to an SS/TC I wouldtake the megan racing exhaust and have a custom flange made to match the one for the SS/TC and use it. It sounds amazing and I've even had Honduh guys comment on how good it sounds...



If I remember correctly their exhaust for the SS/SC is 3" too...

I'm not too sure what size theirs is for the SS/SC, I just know the exhaust they are promoting and selling for their SS/TC is 3". I get the Honda guys commenting me on how well my Mustangs exhaust sounds, LOL.

Can't believe everything you read on a vendor's website. Here this should shed some light on what I'm talking about. YOu need to find the exhaust that allows the maximum velocity for the exhaust exiting the tail pipe. Here are a few quotes that explain what I am talking about. I fond them in a thread a few weeks ago and I really think they explain the subject very well...

Its not backpressure that improves the low end. Pressure in the exhaust of any kind is bad.

Its proper exhaust sizing that allows maximum exhaust gas velocity at the lowest amount of pressure to aid in exhaust gas scavenging.

Too large of a pipe will not allow maximum exhaust velocity. Too small and it creates backpressure.

getting there!~

in simple terms, let me tell you what backpressure is. your engine blows out air. the air needs to get out of the exhaust. having the proper size exhaust give you the proper EXHAST VELOCITY. the idea is to get the air out the end of the exhaust as quickly as possible. if the exhaust is too big, the air kinda "dribbles out" the end. if the exhaust is too small, the engine has to work harder to "force" the air out. having just the right size piping however gets the air out fast enough, lets the engine run more efficiently, and doesn't create any drag.

now, backpressure and why it's bad. backpressure is jsut what it sounds like. air moving the WRONG way through the exhaust, back towards the engine. when you have backpressure, your engine now has to work harder, because the air it is trying to force out is being pushed back towards it.

i like to use a straw and spitball analogy, because it's easy to understand. take a spitball, (represents the air coming out of the engine) put it in a straw, (represents your exhaust) and blow. if the spitball is the right size for the straw, it shoots out across the room with very little effort. take that same spitball, and take a paper towel roll, (exhaust that's too big) and try to spit it across the room. doesn't work. it just flops out the end. doesn't seem like anything, but if you were spitting thousands of spitballs, they would be hitting each other holding up the flow.

so now, let's say you are trying to spit the spitball, and someone else goes on the other end of the straw and starts blowing back at you. that's backpressure. you're trying to shoot the spitball, and someone else is blowing it back at you.

that being said, in no way, shape, or form is backpressure good, regardless of engine, car, type of induction, etc.

i hope this makes more sense and helps you realize why backpressure is no good, and also why the size of the pipe is also very important.

you're basing the best exhaust off of looks?

seriously?

megan racing sounds like hammered ass on a ss/sc car. really. anything does.

some of you are forgetting something important here.

STOCK DOWN PIPE.

Hmmmm.... I don't know why we are talking 'back pressure' in the LNF section.... cause when your talking turbo, go big diameter, or go home. You don't want to be choking that turbo on the downstream side.


STOCK DOWN PIPE.

I try to assume they're all keen enough to upgrade that with the beauty piece being sold by Synapse.

well fuck then lets just get a 6" pipe and be done with it. If you get a pipe that's too big you slow the exhaust gasses down exiting the exhaust and that's just as bad as backpressure...

well fuck then lets just get a 6" pipe and be done with it. If you get a pipe that's too big you slow the exhaust gasses down exiting the exhaust and that's just as bad as backpressure...

Are you talking turbo, super or N/A?
Cause if your talking on the LNF (turbo), you'd better re-think that.
Turbo'd engines are a very different creature than the other two, on the exhaust side.

tell ya what there chief.

lets compare something.

my cute little 3 inch dp and catback exhaust to ANY 2.5 setup out there. which one will make more power on my car?

btw. comparing turbo to blower is stupid.

anything. When your pipe diameter is too large for the motor the exhaust velocity will slow down. You want the exhaust gasses to exit the car as fast as possible. You have to find the proper diameter so that you aren't choking it and on the flip side you aren't hurting the velocity of the exhaust exiting the car...

anything. When your pipe diameter is too large for the motor the exhaust velocity will slow down. You want the exhaust gasses to exit the car as fast as possible. You have to find the proper diameter so that you aren't choking it and on the flip side you aren't hurting the velocity of the exhaust exiting the car...

A turbo'd car gets it's 'backpressure' (gawd I hate using that word) from the turbine.
It's not the same as a blown or naturally aspirated engine.

::looks at dyno numbers::

um
right......

go forth and spread your........... knowledge.

tell ya what there chief.

lets compare something.

my cute little 3 inch dp and catback exhaust to ANY 2.5 setup out there. which one will make more power on my car?

btw. comparing turbo to blower is stupid.

Dude you are also probably between 275 hp and 300 hp at the wheels (just a guess based on your mods) which puts you in the range I said is good for 3" exhausts...

i like the Hahn and corsa tour

if back pressure ment so much. why do big turbo guys run 5inch dp's that are about 3 ft long?

oooohhhhhhhhhh the pressure build up is between the head and the turbine wheel.

Dude you are also probably between 275 hp and 300 hp at the wheels (just a guess based on your mods) which puts you in the range I said is good for 3" exhausts...

close. im over 300.

i have had the same exhaust from 230 whp on up.

I bet you knew you were going to be built up quite a bit in the future. Which makes sense to buy the exhaust for what you are building rather than buying a small diameter exhaust and then spending more $$$ when you do your mods and need a bigger exhaust. You were looking a head I'm sure. but like I said for most stock or lightly modded Cobalts 2.5" or 2.75" would be sufficient and work out nicely...

I bet you knew you were going to be built up quite a bit in the future. Which makes sense to buy the exhaust for what you are building rather than buying a small diameter exhaust and then spending more $$$ when you do your mods and need a bigger exhaust. You were looking a head I'm sure. but like I said for most stock or lightly modded Cobalts 2.5" or 2.75" would be sufficient and work out nicely...

Stock SC or TC? If you are talking SC, a 3" might be too large. If you are talking stock TC (with 55 more HP), it would be sized appropriately.

IMHO either. If you plan on modding it out to be the friggin animal then yea go big now so you don't have to be constantly changing exhausts but if you just want a CAI and maybe a tune then 2.5" or 2.75" would be sufficient.

If you are talking stock TC (with 55 more HP), it would be sized appropriately.

You have a TC... but a 3" on.

You have a TC... but a 3" on.

That is what I assumed based on the information I received from Hahn. They think that it is appropriate for anything 250-500 HP.

I'm not planning on doing much modding other than the exhaust and maybe an intake. I think that the 3" would be fine for us stock TC guys...

3" is definitely fine

other cars push 600+ hp out of 3" pipe, under 300 won't be a problem

2.5 inch dp and 3 inch cat back
:)

the stock DP is 3in I believe

I really dont think anyone could beat the Hahn exhaust..

Ok when it comes to turbo cars the only "backpressure" you need is from the turbo itself. As far as the exhaust goes you could hack it off after the o2 sensor and it wont make a bit of difference. I have personally run open downpipes on my talons at the track. The bigger the better. 2.5" is good for up to 400hp... how much are you honestly expecting to be making out of this LNF in the near future. I mean you could go and spend the $1500 get the hahn programmer and exhaust and get an extra 30hp and you are only at 290whp...

Get the 3" since its the only one available right now and look at it this way, You will NEVER have to replace it unless you go over 500hp.

Sidenote...$1500...30whp... I think I will wait...

in general you want to keep the intake mani pressure higher than the exaust mani pressure to make maximum hp and tq... so in other words bigger is better for the exhaust. The reason why the exhaust speed would be decreased is because it flows more. you are moving a higher volume through it regardless of speed. I am talking about cfm's, thats all that matters.

Hahn makes some nice parts for sure.

I think the company that made my cat back is working on a system tuned for the SS/TC.

From what I was told, the first prototype/version of my system yielded so so results. Apparently they reduced the pipes after the y to 2.25 and bettered stock nicely both at the bottom and top. As this companies history came from 2 stroke machines, their obsession with fine tuning exhaust has carried over to their automotive side with specific attention to the power band. It seems to me, in the LNF car, that ultimate flow might actually have some negative effects. At least on an otherwise stock car. I can report that my car seems to run less boost than other examples. I can't be sure it's the cat back giving me the gift, but it's likely helping out veery well considering what the dyno showed.

While the difference in the ss/sc and ss/tc systems are likely easily overcome to fit, I would prefer a system that is tuned to sound sweet. That turbo in the way makes all the difference. Most systems will be adequate for your needs, but I have seen too many guys have to chop up well made SS systems to get them to sound just right. I think mine does. check my sig.

When it comes to supercharged or N/A cars, exhaust pipe size is very very important. When it comes to turbo cars, the turbo is already restricting the exhaust considerably, so as big as you can go wont hurt at all. For most of us turbo'd, the 3" is all we will ever need (unless you are one of the rare few that are going to hit over 500whp). Going big on the exhaust with a turbo will not hurt, it can only help. Going 3" on a STOCK superchaged car (no stage kits) can hurt performance.

From what I have heard about Hahn's products he knows his shit. Get the exhaust and call it a day

..its a work of art, I almost hate to put it under my car.

hahn FTW

Do any of you guys speak from experience? Have you looked at the 3 in exhaust dyno graph from Hahn compared to the stock exhaust dyno run? You lose power down low, but make it up later. If peak power is what your looking for the 3 in is great. It will just take you a little longer to get up to speed due to the power loss on the bottom.

Have you tried a 2.5 in with no muffler? You again lose power down low.

Wait until somebody can show dyno charts with improvements through the entire power curve.
Don't be in a rush to listen to a vender and buy an exhaus without a dyno chart to prove the results.

Note: If all you are looking for is sound then you can buy whatever you like. If you are looking for inexpensive (under $100) go for pipe only with no muffler, its still quite. Is either one as good as stock NO, I have seen the results on the car.

Just my 02, It kind of bugs me when guys talk about stuff and theorize about everything. As with most forums, there are a few guys that know what they are talking about, others just talk.

Hope this didn't get taken wrong. It was not meant to, I was just trying to give honest advice and cut through the BS.

I am just curious, did I miss something? The only dyno results I saw with the 3" cat back was ALSO with the PPC so any results comparison about the stock vs hahn exhaust don't count for shit... and I still won't pay $1500 for 30 more hp. I will wait untill there is more improvement. Shit if this is how expensive it is gonna be to modify this car, I may just keep it stock and get my AEM EMS for the Talon lol Maybe even wait and see if somekind of standalone management comes out for this thing.

No you did not miss anything, however Hahn does have a dyno chart showing results with and without their cat back exhaust. It is not on this forum, but it is out.

I am just curious, did I miss something? The only dyno results I saw with the 3" cat back was ALSO with the PPC so any results comparison about the stock vs hahn exhaust don't count for shit... and I still won't pay $1500 for 30 more hp. I will wait untill there is more improvement. Shit if this is how expensive it is gonna be to modify this car, I may just keep it stock and get my AEM EMS for the Talon lol Maybe even wait and see if somekind of standalone management comes out for this thing.

I have dyno charts linked in my sig for the stock and 3" on a Kappa car with the LNF.