would putting a aftermarket manifold/downpipe with highflow cat void warranty???

 

o my god, NO IT WON'T!!!!

 

Your post made me think about something I've always wondered: Why do most people (especially on this site) think that aftermarket is always a better product than GM parts? Is there any proven numbers, or is it just because they are more expensive? It just seems to me that GM has much better engineers, resources, and facilities than any aftermarket co., not to mention they know exactly how the car was built in the first place. It seems that the attitude of today's car modders is that aftermarket is best, but I've never known exactly why. I can understand if GM doesn't offer a certain product (such as a downpipe), but when they have a competing product, it just seems strange to me that it wouldn't be the best. Maybe I'm placing too much faith in GM, or any car manufacturer for that matter?

 

I'm not necessarily saying that aftermarket is absolutely, positively, better--but I just haven't seen anything to prove otherwise (flow/dyno comparisons)--I used to have a GM manifold--when I got it, i thought it was some kind of a sick joke. If I wanted a honed stock manifold, I would have honed mine. Buyer beware, I guess. Hehe. So I sold it locally and am saving up for the DC Sports or Vibrant. Most likely Vibrant. Theirs seems to be a better design, and all-inclusive with a DP and a highflow cat. Now for Stage kits, I'm sticking to GM. They designed the engine/supercharger setup, so they know best. Most other canned tunes I've seen make your car go boom. Canned tunes are okay for a baseline, but unless you have HP Tuners, I don't see the point in a canned tune. I can't afford HP Tuners and no other cobalt owners in my area have it, so that's where GM comes in.

 

I was thinking the same thing... my guess would be 15-15 with everything, including Header, dp, cat back.... maybe 20 - 25 at the most

 

it may be illegal, depending on local laws.

 

I am just going to stick with the GMPP manifold not just for warranty but for the fact that it is GM engineered. In all honesty I had a pacesetter header for my cavalier and it leaked from day 1 and wouldn't stop I tried everything from tightning the bolts to having the gasket replaced once nothing would fix it, aftermarket isnt' the best all the time. 7% isn't alot but it is better than stock.

 

GM is good stuff, it won't hurt warranty, same gains as other brands with great quality. My choice soon

 

I would have to agree. It may not be the best performance but if something goes wrong with it, it will be covered under warranty. It's a lot cheaper in the long run.

 

Agreed, but I am not just getting it for the warranty I am getting it for the GM quality part. Won't have to deal with fitment issues and whatnot unlike some other aftermarket brands sold for the balts now.

 

Cobalt Extruded Honed Manifold 19131972 Description
This Extruded Honed Exhaust Manifold flows 30cfm more than the stock manifold. You can expect about a 4hp and 6ft/lbs of torque from it. There is a definite performance gain from it and it shows in the upper rpm range and in the 'seat' dyno. You'll also notice a different sound from the exhaust



Taken from CED


06 ss/sc

 

does it make a diff in the sound on the GMPP catback?!

 

I have no clue with this one, would like to know though. I believe that the sound would be a bit louder considering it does flow a bit better especially if you get the Down pipe as well. The only thing I hope is that its not raspy.

I am hoping that the noticable power in the upper RPM range will actually make the extra 500 rpms with stage 2 useful.

 

It could be my exhaust finally breaking in but I noticed a lot more popping and cackling under deceleration. I like it but I know some people don't care for that at all.

I put the exhaust on last Tuesday and the manifold on Saturday, about 50 miles apart so you can see why I wonder if the exhaust was just getting broke in. I haven't heard any other GMPP performance exhausts in person so I don't have anything else to use as a base.

 

has the tone changed tho?! raspier, deeper?

 

Sounds to be the same exact tone to me... I wouldn't expect big changes, afterall it is the exact same piece only extrude honed.

 

I ported mine, actually taking out some material and removing some of the pinch points, and I noticed the tone get deeper, and a little more burbly down low. Kinda sounds like I have cams at idle now. I like it.

I can port a stock manifold if anyone is interested.

 

Im gonna go with the zzp stainless header to accompany my zzp downpipe i have right now and then the gmpp performance cat back

 

i have the cti header, no leaks, sounds great and big jump in performance. as for the comment with gm making the best parts i have to disagree, they make good parts but you are always going to get more from aftermarket in most cases.

 

very interested, pm me!

 

I dont get what's so big about headers and everything. Ive experienced many cars before and after header installs and it seems like a waste of money to me. If the stock manifold shows an improvement by getting honed, then do it yourself and save a bunch of money for other more important mods. Not trying to sound like an a**hole, but why get more power out of the car if all you have is wheel hop. Shouldnt this be the thing to spend the money on.

 

A good exhaust benefits alot more than just the max power. Yes, it is a good idea to modify to help rid of wheel hop first, and most people do that on this site if they pay attention to the advice given or already know what's going on.

 

your exhaust wont really sound raspy it will just sound deeper in tone.

 

Have ingalls tq dampner alreaedy, plus drag racing really isn't that big of a deal to me, just having fun with the car more or less is...just have to launch a bit easier thats all.