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Eclipz · 10-29-2015, 10:33 AM

Test pipes are almost always louder and gain more power (with a tune) than HFC's.

But if you want really loud, you should get some long-tube headers and ditch the cat-back completely

10-29-2015, 10:33 AM	#4 (permalink)
Eclipz Enthusiast Member Join Date: Dec 2013 Location: Tampa Posts: 360 Drives: 06 Eclipse GS Rep Power: 11	Test pipes are almost always louder and gain more power (with a tune) than HFC's. But if you want really loud, you should get some long-tube headers and ditch the cat-back completely