I have the Berk HFC and CBE and am very happy with the sound. Don't know what the actual HP gains are, but the "butt dyno" says that there was some increase.
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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