i was wondering how do think a 3" exhaust would sound on a 08 cobalt coupe be honest let me know because i have a 2.5" exhaust now with a flowmaster and i was wondering would it make that much of a difference in sound thanks blackout 09

 

You don't want to go any larger than 2.5" if you have a 2.2/2.4, unless you are turbocharged. You'll lose power, back pressure, and I would guess gas mileage. Sound I have no idea about.

 

agreed, 3 inch is too much for your car.