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I am installing a Stillen CBE on my 07 G35 Sedan on Wednesday when it arrives. I currently run a R2C intake with Berk HFCs and cannot wait for the last addition. My question for you is what particular difference (& good or bad) of installing the HFCs with the Stillen CBE on your G sedan. You are literally the only person I've found with HFCs on the V36 sedan with the Stillen CBE. Very interested in your opinion on better/worse sound with HFCs and more/less rasp. My cats are already broken in (1500 miles) so I'm ready to break that exhaust in quickly to see what it all does.