Welcome to AF.
Yes. You can use the Pacesetter Monza CATBack exhaust system which has 2.5" plumbing all the way to the tips. Same one that fits the Grand AM GT. Same hang points and a bolt on operation. Also, headers and a re-programmed PCM module from DHP plus other mods. Thread below has info on the DHP PCM.
Click here
Here is a pic of our '02 Alero GL2 with S&S ceramic coated headers. Same ones for the Grand Ams with 3400 engine. Also, it has a RSM Racing 62mm throttle body.
