Does anyone know how much sound difference the RV6 HFPC's cause? I have seen videos that have stock TL's with the HFPC's, but I would like to know if anyone has any videos of an XLR8 exhaust with them (preferably not resonated) or if anyone has heard it. So basically I just want to know if they are a good way to increase sound as well as performance without rasp and bad smell like PCD's.
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