what is the diameter of our stock exhaust pipes? i was thinking about this http://www.modernperformance.com/all/qtp_cutout.shtml

 

I think it is 2.5"

 

i believe its 2.5 the magnaflow is the same diameter as stock...

 

2.5 is the optimal for our motors. Just making it better flowing is what we are trying to do

 

does anyone know how to make the cobalt's exaust not song like a ricer

 

Use resonators and go dual... Dual exhausts are quiter than single exit.

 

where would u get resonators

 

do you think that thing from modern would be worth it tho?

 

Thats really your call as to if you want to be able to quiet your exhaust with the flip of a switch.

I personally would just go with a catback exhaust.

 

well i was talking about at the track. do you think that there would be any gains from it from the stock exhaust?

 

Stock exhaust is 2,5" piping, except for the rear section that is 2,25". The Magnaflow 2,5" catback will roughly gives you 10 WHP. You can also got the rear 2,25" section replaced and the stock muffler replaced by a Magnaflow, both giving roughly the same result than the Magnaflow catback, but at a lower cost. Here is a how to :

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/how-custom-magnaflow-vibrant-2-5-ss-catback-intake-mod-parts-needed-5478/

 

do you think that this will give the same results as the magnaflow exhaust? i dont care about it on the streets, just the track

 

2.5" exhaust is good for stock to very mildy modded Cobalts. But if your pushing 230whp, I really think the 3" is going to give you more benefits. But I guess that wasn't his question.

 

i got dyno numbers of 231 HP and 215 TQ, so you think i should get 3" exhaust now

 

People who say get 3" really have no idea what there talking about, a single 2.5" exhaust on our cars should be enough for above 300WHP.

Look at a stock LS1/LT1 exhaust the single intermidiate pipe on both is 2.75" even though that is a bottle neck on those cars it is more than enough for a S/C 2.0

It doesn't matter if a S/C moves alot of air it still can only displace 2.0 liters of it at a time.

 

2.5 inch exhaust is plenty for any amount of power your going to get using a motor with completely stock internals and some mods, including stage 2 when it comes around.

See my thread on the just released Corsa Sport exhaust. Their engineers have put plenty of time into answering this question.

 

Hey i getting a cobalt ss supercharged i just havent deiced if i should get the performance package or not iv herd that it does make a big diffrance but is it worth it for 1500? i work at RK chevy in Va if any of yall have herd of it IM a Subaru tech but ever since i drove the cobalt i loved it Sticker price is 25300 but GMSR the employe discount i get is 22500 not to to shabby but i want an opion Performance Pakage or not??? please Comment

 

i got my '05 cobalt for over that price and mine doesnt have the performance package, i'd say its a good deal

 

i was just wondering if the short throw really makes a diffrance.? they say it already has one is the B@M one more agressive?>

 

i got mine for 7500 cheaper with no performance package... they can come off that price...