FI exhaust options HFC or ART test pipes or?

forza370z

But you forgot ART pipes are not regular test pipes. That's what that 2 "grenades" for. They are resonators. And as you just stated yourself they do their job quite nicely. Here is the sound level from what I heard people were talking for years.

Test pipes > HFCs > ART pipes > RHFCs

Be honest tho, HFCs and ART pipes are very similar. Test pipes are louder for sure. But then again, like I posted earlier, my ears might already got damaged! LOL

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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC