Ok this has been driving me crazy!!!
First off I drive the NA 2.4 and i want to get new DP header and Cat because i just bought a 2.5" corsa sport catback.

I want to go along the lines of ZZP because of there good reviews and rep.

my problem is that the longtube header package is 3" and i am not sure if that is to wide for the NA engine and also being that i already have a 2.5" catback.

I have also seen on there site that they have a 2.5 DP/Cat. but if i went with that i would have no idea what header to put on that because i honestly have no idea what size primaries ect. to go with.???

Please help me and keep in mind i have inspection coming up so i need to pass that!

 

badmab is the best bang for the buck

 

What is the best header regardless of the pricetag???

 

This is an great choice, awesome quality and NEVER any issues:

Vibrant Stainless Steel Header Chevrolet Cobalt 2.0/2.2/2.4L 2005-10 (Cat-Con) - Turbo Tech Racing, LLC

 

Honestly regardless of price would probably go to one of the longtubes.
So either zzp or ottp most likely (no dyno proof yet though)

 

This is the thread that explains my problem but i am open to other brands other than zzp
https://www.cobaltss.net/forums/2-4l...exaust-243389/
Imput is Greatly appreciated

 

Why 2 threads, just post that info here.

 

sorry ive been searching for help for a while so i have multiple threads lol anyways-

Ok this has been driving me crazy!!!
First off I drive the NA 2.4 and i want to get new DP header and Cat because i just bought a 2.5" corsa sport catback.

I want to go along the lines of ZZP because of there good reviews and rep.

my problem is that the longtube header package is 3" and i am not sure if that is to wide for the NA engine and also being that i already have a 2.5" catback.

I have also seen on there site that they have a 2.5 DP/Cat. but if i went with that i would have no idea what header to put on that because i honestly have no idea what size primaries ect. to go with.???

Please help me and keep in mind i have inspection coming up so i need to pass that!

 

Any1???

 

Maven is running ZZPs longtube on his 2.2 and says the butt dyno reported a very nice increase.

With that said when i had their midlength on it had a 3 inch to 2.5 catted downpipe and the increase especially uptop was very nice.

 

Thank you I think im going to call zzp and see what they have to say for a second opinion

 

the badmab header bolts to zzps dp. you cant run a longtube with the 2.5 inch downpipe they sell. they send a dp with the lt

 

Im pretty sure u can do 3" but the dp exit ask them to drop it down for u. they offer that i believe. I just looked it up ya it does. email them believe me they will answer all ur questions.

 

I've had quite a few guys team the header up with a zzp 2.5" dp.

 

My problem is that the badmab header is the same size for the 2.0, 2.2, and the 2.4 which makes no sense. correct me if im wrong about them being the same size.

 

This 100% stainless steel header is a direct replacement for ALL Chevy Cobalt FWD engines: 2.0L/2.2L/2.4L. This kit includes:


4-1, 1.71 inch, equal length tubing and a 3 inch collector for maximum flow

bad-mab and same thing with CA-V2

 

Youd be pretty happy with the badmab and zzp catted 2.5 downpipe like he says above.

I not an exhaust expert by any mean and wont pretend to be. I prefer the 3 inch reduced to 2.5 exit catted downpipe, just seems to make more sense to have a smoother transition to me then suddenly going from 3 inch to 2.5


But maybe someone who is more up on exhaust will reply.
But what badmab said will work nicely for you and you would be happy with it!

 

just get the zzp longtube with the 2.5 bolt in

 

Talked to a guy from ZZP 3" is too wide for NA and they dont make any header combo that is 2.5" anymore

 

I ran a 3 inch reduced to 2.5" from zzp (downpipe for the midlength) and it did slightly kill lowend though I still had enough that from a stop I could light up the tires for about 5-10 feet. Not bad for an auto. I do agree a full 3 inch is too much. But I like the idea of a 3 inch to 2.5 inch reduced downpipe considering most headers collectors are 3 inches.

They do still sell that downpipe
https://www.zzperformance.com/cobalt...1199&catid=155