I've installed the R2C short CAI and there is no noticeable exhaust sound differences. They do seem to be better (for performance) at the upper end of the RPM band. I could feel the car running out of steam (@ 110 on the track) and since I installed them, the running out feeling was gone. See my mods in my signature below.
Just my $.02...
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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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