The warranty is up so it is mod time for my 05 JCW MCS.
I already have a new header and high flow cat, CAI filter upgrade, and a new cylinder head from Thumper on the way.
Once all the mods have been done I have a Dimsport custom tune lined up.
The only thing I can't make up my mind on is the SC pulley....
The 3 options are
1. M7 16% SC pulley
2. M7 16% SC pulley + 2% crank pulley
3. Keep the JCW pulley and add a +3% crank pulley
What do you guys recommend?
Cheers
D-MAN

 

16%

 

Option 4: 17%

Actually, what are you going for? Street performance? Drag performance? Trackday performance? If you're gonna live at high RPMs (on the track) I'd stick with 15% or 16%. If you're looking for extra low-end "umph" and won't spend much time near redline, I'd go 17%...