i just got a 05 cobalt lt im wondering whats the best catback exhaust system i can get power wise?

Don't expect alot of power from a cat-back only.

Corsa is VERY good (touring version)

Also Vibrant 3.0" for all out power.

Sorry but 3" on a N/A four cylinder will make you loose power not gain power.

a catback isnt all im going with im looking to get headers cold air intake and eventuly get a garrett turbo setup

a catback isnt all im going with im looking to get headers cold air intake and eventuly get a garrett turbo setup

If you really are going to get a turbo for your 2.2 you need to look into ECM piggybacks since the 2.2 ECM is not tuneable. Additionally, if you plan on getting a turbo then DON'T get a header as the turbo system takes the place of the exhaust manifold/header.

The best price cat-back exhaust is the GMPP Performance exhaust -- best price is at crateenginedepot.com -- but only until they sell out of the $357 supply -- then the price will go up to around $500!

what companies make the ECM?

im sorry, meant the ECM piggyback

I belive AEM is the only sure fire unit right now.