my friend is using RXZ mcycle spark plug Denso
(same heat as NGK plug type 7)
on his vr4 engine since it's quite difficlut
for him to find cold type spark plug (type 6 above)
since turbo engine quite hot...
usually...
guys, wats the recommended exhaust setup for a standard gsr? using the original route or getting a 4wd tank for direct piping thru the center?? will there be any differences in terms of performance?? pros and cons of...