gtxpro2

Hello all I have an 07 S281e car... and was wondering what the stock pulley size is, I am looking for a little more boost. I also saw a 6 rib set up by GI Joe any feed back on that set up?

PolkThug

Literally, pop your hood and put a ruler across the face of the pulley for the size.

sftdyna

you have a 2.8 inch , if you want more boost you will nee to change the lower crank pulley to a 10% set up.....should get you 2lb more which with a good 93 octane tune will give you maybe 25 hp.

S281 E

Should be a 2.9" pulley. The crankshaft pulley swap is a nice upgrade, but if you plan on changing all the pullies do the GI Joe 8 rib setup. Could also add a C&L CAI or the 08 S302E CAI for a little more power. I would not go smaller on the blower pulley on an extreme.

sftdyna

i dont even think they make a smaller upper because of belt slip, brenspeed rarely use the 2.875 upper at all, they perfer to use a combo of 3.00 upper with a lower to insure no belt slipping.