whats the difference ?
berk hfc are another product people put on a pedistool on this site... is the cat any free-er flowing ?
the differerence in performance will not be noticed.. and from my experience stillen would replace your hfc if they started leaking as they have had great customer service for my parts.. I would just keep your HFC
or get test pipes
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09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)
Last edited by chuckd05; 01-07-2011 at 02:05 PM.
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