No, they don't.Originally Posted by HVACgtp
Especially with no resonator.
Here is my car with Flow 40's no cat, no res...if this sounds good to you then you need your ears checked: XP Cam Start Up video by bluegtp03 | Photobucket
Then, I added a factory resonator: GTP Exhaust - YouTube
After that, bigger cam, ported heads, glasspack instead of factory res, proflo style muffler, and full 3" all the way back to 4" tips, no standard mufflers like you all run: GTP Big Cam Idle/Rev - YouTube
ANY for of resonator is the KEY to a decent exhaust note, the cat is not. Quiet mufflers is also what you want, because Magnadrone's and Dronemaster's and Blowla's all sound poopy and tinny.
