alright heres the deal

im getting a cti header and downpipe and im probably taking the cat out

its a 3 inch downpipe but im thinking of having him flange it so i can put a corsa exaust on


i have heard nothing but good things about the corsa exaust but here is my question

since im wanting the most power (not really worried about the sound unless it sounds like ****) i was wondering if a corsa with supposively 12 hp gain would be better compared to a 3 inch???? and if not what 3 inch should i get???

it would help even more if you have dyno numbers to prove you argument

all the help is appreciated

 

unless you're running a 2.6/2.5 inch pulley, go with the corsa

 

I personally dont like the way corsa sounds. I know you said you dont care what the sound is but to me it's not too great having heard one in person.
if you're looking to do wuite a bit of modding go ahead and do a 3" custom exhaust. you can pick your brand. I haven't heard of any flowmaster exhaust being put together yet maybe you could be a test dummy for that.

 

Try the vibrant 3" and let me know what it;s like

 

I built a 3in magnaflow system and its amazeing!

not to loud a good tone...plus all that flow!

 

do u guys have any numbers on hp gain though?

 

I have the vibrant 3". Originally had the corsa touring but wanted all I could get so dumped it.

 

did you feel the difference??? or was there any

 

Any proof that you gained anything from it?


From everything I've seen/read, etc, Corsa flows as good as a 3" exhaust. I talked to a Corsa rep in person, and he said that there is no need for a 3" over their current exhaust, and that it flows plenty even for highly modded cars.

 

i trust this guy

what kind of increases did you see out of your cti and corsa??

 

Yeah it was worth a few tenths in the 1/4. Do you think a corsa rep would bad mouth his own product?

 

Yes there is a difference but you will loose a llittle down low but gain more up top.

 

corsa exhaust flow


eaton m62 gen v data

so what can we deduce...the blower is cramming 550cfm in near redline...500cfm u could say based on 20psi of boost

the corsa only flows 410cfm

motor is flowing it is...can someone post the specs from the gm performance handbook?

Basically the head is the restriction but still the exhaust flows less than the blower at the levels us small pulley users are at. I say y restrict yourself...go as big and well flowing as possible to prevent having to redo it later.

Dan

 

This will be even more important for the guys with ported blowers as mine is ported.

 

dan,

I dont know the specs of the head of hand but i rmember that the stock exhassut manifold is only good to like 300-330cfm.

 

OK I'm confused. Was this a comparison of CobaltSS stock Catback vs a Corsa Cobalt SS catback?

What was the pressure drop used to determine the flow shown on the chart.

Thanks

Pierre

 

Corsa wouldn't have the good, reliable name it has if they were full of it. Also, a "few tenths" is due to you getting a better 60', not because you made more power from Vibrant. If you gained power up top like you're saying, your trap speed would consistantly be noticeably higher than with the Corsa. Traction and good torque effect ET's more than horsepower. Basically, if you don't have any solid before and after dyno's, and before and after timeslips, it's not a fair comparison anyway's. Of course I'm typing to a guy who claims to run 12.8's, with no proof of that either.

 

Dan, you need to read 06black's response. The manifold becomes the restriction, not the Corsa. You can run an open stock manifold and still have a restriction since the stock manifold doesn't flow well. Your arguement is not valid. The only way to truely test the flow of the Corsa, IS TO MAKE SURE THERE'S NO RESTRICTIONS BEFORE IT.

 

Beleive what you want that is your choice. I did have before with the corsa and afters with the vibrant. Im sorry but I dont intend to go buy a scanner or a cmaera to take a picture for one time as I have absolutely no use for them at all.

 

I don't have any type of data yet. I will be going to the track soon, and I will be able to tell you what difference the CTI made. I also scan, so I will be able to tell how "free flowing" the CTI header is by the amount of boost drop I see.

 

I understand, and it's not worth buying a camera just for that. But you can't honestly debate how much "better" your Vibrant is over the Corsa, if you don't have any valid proof.

 

What is valid proff then may I ask? Proof to me would be quicker 1/4 now wouldnt it?

 

Valid proof would be before and after dyno sheets, on the same dyno with the same correction factor. Other proof that would atleast show a power increase would be a trap speed comparison on timeslips, but those are only accurate if the weather conditions and 60's are the same. Remember, "quicker" means lower et's, "faster" means higher traps. A power increase would net a higher trap speed, while a torque increase (assuming the 60's are the same) should net a lower et I would think. In other words, if you ran 12.9x@108mph with the Corsa, and then ran 12.8x@108 with the vibrant, you didn't gain any power, you hooked up better.

 

My traps did improve when I went to the vibrant.

 

Cool! By how much consistantly?