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Read, research, get at it broham.

This was my car with Flowmasters, catless headers, factory resonator, 3" piping, and an XP cam: GTP Exhaust - YouTube

This was my next setup with catless headers, a long glasspack for a resonator, then a bullet style proflo muffler before the "Y" with 3" piping to 4" tips and a much larger cam and ported heads: GTP Big Cam Idle/Rev - YouTube

Then before that out the back, I had it dumped without the proflo muffler: Big Cam GTP Idle & Rev - YouTube

It was fun-ish. Still sounded like crap because it's a FWD, 90* V6, 3800.