many exhaust sounds great without HFC. we all need to find one that does WITH them (none that i know of so far, except the nismo). do you have any clips of your exhaust with HFC installed? looking to get rid of the metallic hiss...
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2009 PW Sport/Touring/Nav M6
Stillen Gen 3 Intake/CBE/Berk HFC/BC BR Coil over/Phillips 6500k/Hotchkis Sways/Stillen oil cooler/B&M SS
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