Rasp...coming from what part of my 370Z's exhaust?

marcussoori

Hi all, I have Stillen G3 long tube intakes, stock headers, Berk HFCs, and the Stillen CBE.

When the car/engine is cold I have lots of rasp at low revs, which goes away after the car is warm.

When the car/engine is warm or cold, I have lots of rasp under heavy load from acceleration.

It's starting to get annoying, as the rasp wasn't there when the parts were first installed. Anyone know if the rasp is coming from the HFCs? Or is it coming from the CBE?

If the HFCs are the culprit, will I eliminate rasp by switching to test pipes? Will the exhaust get louder (remember, Berk HFCs currently, not stock cats), even at cruising speeds?

Finally, some with exhaust plus HFCs/test pipes say there's an "air fart" noise on overrun (letting off throttle after accelerating), would this be even louder with test pipes than HFCs?

Thanks in advance!

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Stillen CBE & G3 LTIs, Motordyne M370, Berk HFCs, H&R 15/20mm spacers, CiNcity headlights, yellow OEM strut brace, Password: JDM CF engine bay parts, EVO-R CF front bumper parts, CF "Z" badge, VIS CF hood, Fujimura CF "diffuser", Show-N-Go plate frame, Katzkin red interior, interior CF, Pioneer BT-90 full system, Viper SmartStart