Thread: Make a GT into a GTP, p.i.t.a. ? Anyone do it?

Originally Posted by matt5112

Are you running the stock pulley?

Yep. And after some of fastkatt's tuning I've got zero knock most of the time. SOMETIMES I see .5*. 3.8 pulley. Some say to do 4.0, but from what I've seen that's not necessary at all.