CobaltSSilver

Not bad at all. I noticed you had a cel then cleared it. What did you use to clear the CEL and what DTC code are you getting? Is it from the K&N CAI?

Also any drone in the cab from the Pacesetter header and customer downpipe? I'm still tyring to decide what is worth it and not. I've considered GMPP Header and GMPP Touring exhaust, easiest on the ears no warranty worries and generally speaking cheap.

The other way I've thought about going is zzperformance header and 2.5" downpipe, and Corsa Touring Exhaust.

Blown 4-banger

The cel was from not having a rear O2 sensor, the exhaust drone... deafoning, but its the price you have to pay for having a racing exhaust on the street. I cleared the cel with a code reader that Waylin 22 let me borrow.

CobaltSSilver

Yeah I think I'll go with GMPP Header and Corsa or GMPP touring exhaust. I can't stand in-cab drone it's just not worth 5 or 10 HP that I could get extra out of the vehicle. I'd rather HP tune it with the GMPP Stage 2 and GMPP exhaust setup.

Is the code reader just a standard ODBII DTC code reader and clearer?

CobaltSSilver

Any drone from the GMPP sport exhaust in the cab? Anybody have a sound clip from in the cab cruising and WOT in the cab? If there's already something posted and I missed it please direct me there.

Thanks!

CobaltSSilver

Still going back and forth I know, thing is bang for buck I think the GMPP sport is the best, and if it doesn't have drone in Sport form I am going with that since ca has it for 440 shipped no tip.

CobaltSSilver

The tip is just cosmetic correct? straight vs. angle is just for looks and both will protec the bumber just fine I take it and has not performance benefit.

hackeragent061

how much hp with the gmpp exhaust add to a 2005 cobalt ls with the 2.2L

Blown 4-banger

I wouldn't suggest going with GMPP if you plan on going with a smaller pulley (<2.9"). It will give some more performance while stock, but once you increase boost, it will hurt performance due to lack of volume.

That Cobalt LT Guy

He has an ls.

CobaltSSilver

I'm running GMPP stage 2 on Cobalt SS/SC right now and I know I will get improvement with the GMPP exhaust. I do keep hearing that if I go with more boost than that Corsa is my best option.

CobaltSSilver

I have an 06 SS/SC with G85 package and all factory options.

Blown 4-banger

No, corsa isn't. You are gonna want to get something thats better flowing. DEFINATLY not 2.25". Corsa is just an extremly expensive exhaust that sounds pretty good, and gives the same gains as any other 2.5" cat-back.

CobaltSSilver

I thought Corsa was 2.5" along with the magna flow.

CobaltSSilver

I am told that anything bigger than 2.5" is a waste with our car.

Blown 4-banger

It is if your stock, or only slightly modded. However its the way to make the most power with a 2.5"-2.6" pulley, your moving so much air at that amount of boost, 3" exhaust is the best.

DomDiggity

Im getting a borla pretty soon ill let you guys know

OniMirage

not neccisarily true. mine is 2 and a quarter yet it is right up there with all the rest of the exhausts as random dyno sheets have shown from various people. Even with a totally perfect tune on a 2.5" pulley with 60's full intake header downpipe I doubt your pushing THAT much more exhaust gases in order for a 3" exhaust to be required. If it offered more flow then it would have more potential but if pro's are moving down from 3" exhausts to 2.5 and sometimes less what does that mean for us tuners? Are we just right and the full R&D big companies have are wrong?

CobaltSSilver

Everything I've heard about running a 3" with the SS/SC has potential for problems and didn't have functional benefit. IF I run anything smaller than my GM Stage 2 Pulley *3"* it will be no smaller than 2.8". I think after I do exhaust manifold, CAI and catback I am going to put some more into the suspension, brakes wheels and tires. Then when the car has some miles on it say 50-100K I'll rebuild it *Even though it won't need it, but I want to see what the powers gains will be* with the GM CNC ported head, GM Camshafts, GM Camgears, GM Ecotech pistons, dual-bypass intercooler, bates or equivalent Titanium valve springs and go from there.

CobaltSSilver

Oh and of course a custom tune and stronger clutch, probably stage 3. Hopefully that won't be too rough for the street, if I can get confirmation on a stage 2 that will handle 300 Wheel HP then that would be preferred.

Blown 4-banger

Pros = 2.9" pulley - 15 psi
Serious tuners = 2.5"-2.6" pulley - 19-21 psi
All I have to say about that.

CobaltSSilver

Just because you have boost doesn't mean you are truly making more power. I keep hearing that the supercharger is good to around 17-18 PSI. Any more than that *You can run small pulley's but you have to handle it properly* and it takes more HP to spin it than what it produces.

08BlackSS/TC

https://www.cobaltss.net/forums/parts-66/f-s-gmpp-sport-exhaust-like-new-great-deal-dont-pass-up-if-you-like-gmpp-44322/

CobaltSSilver

Perhaps I missed it reading through but any dyno numbers for the Corsa? Sport or touring?

1gmfanatik

No one can talk too negatively about going with GMPP's exhaust. DTM2188 has been running that setup with a 2.6" pulley and a bunch of other mods and he put down 271hp and around 264tq. So, it's not all about exhaust size.

OniMirage

a common misconseption by the majority of people tuning their rides. others will see that the gmpp will not be the undoing factor of a 300hp car ... first things first, someone has to get their and has to run the gmpp