I have an 04 coupe 6mt and want to pair my Injen SES exhaust with a set of resonated test pipes or HFC.... My concern is sound... I don't want this damn exhaust too much louder than it already is.... I had straight test pipes before and then sold them b/c of sound. I want some of that performance back so i'm considering resonated test pipes (F.I) or HFC... Please help

 

If you don't want it much louder than it is right now, then go for HFC. Resonated test pipes will definately make your exhaust much louder.

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