Post by
evildky »
https://forums.nicoclub.com/evildky-u13100.html
Fri Aug 15, 2008 6:01 am
you mean "X" ro "H" right? a 'Y" would indicate a single exhaust so is not comperable to the "X", and the "X"a nd "H" bothhave supporting tests otherwise only one would be on the market, it actually comes down to tuning at a specific RPM on a specific engine, the "X" might flow better on your car at one RPM range while the "H" will flow better at a different RPM range