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so how much gain would you get from a 2.25 exhaust? I've read the DP is the most restrictive, so if I started there and worked my way through the exhaust system would I feel a decent gain?


2005 cobalt base model coupe
 

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Cat back and dp with a tune would bring close to 20 probably on a base model. And ya 3" for a sc is useless. Will hurt low torque a ton. 2.5 is a solid size for sc
 

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OK, great. I don't really care for loud.. I'd rather have a stockish look/sound than the look of cannon sticking out the back of my car.

2005 cobalt base model coupe
 

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potentially. the ebay mufflers are pretty much crap. buying a cheap stainless steel catback gives you options for mufflers. i would personally buy a good magnaflow or borla muffler and get it welded on so it doesn't sound raspy
 

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That's fine with me. I didn't expect it to be amazing. The only systems I can really find are ones similar to these, or ones with the "I go so fast my exhaust tip is burnt" tip, or ones for like $600. I'm not gonna spend that kind of money on some metal piping and a muffler lol .

2005 cobalt base model coupe
 

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I'm not sure if you say I beat my car or not. Lol but I actually baby my car.. a lot. I would just like some more power.

2005 cobalt base model coupe
 

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i put a cold air intake on my car and now it periodically throws a cel for a lean code whats a good way to fix it with out going back to stock and i cant tune it tell its out of warranty in 3 years
 

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i put a cold air intake on my car and now it periodically throws a cel for a lean code whats a good way to fix it with out going back to stock and i cant tune it tell its out of warranty in 3 years
Welcome to the P0171 club. You need a tune to clear that up and make the most power out of you CAI, plain and simple.
 

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i put a cold air intake on my car and now it periodically throws a cel for a lean code whats a good way to fix it with out going back to stock and i cant tune it tell its out of warranty in 3 years
go to a flash and get the PCM flashed


^


what the f was i thinking... go to a flash to get flashed LOL

tune..
 
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