Tell your friend to get a cooler TSTAT too... It will lower the engine temps a bit and help with KR. Also get him to make a homemade intake like a FWI. If he won't do headers at least get a PLOG. 3-4* on a smaller pulley isn't cool man. I ran that way for awhile but i also killed some plugs once. Burnt the end plumb off one.
I don't understand why people think they can just buy a pulley and put it on and expect more power and not to damage their engine. Do your research, if everyone could just add pulleys anytime they wanted to go faster we'd all be running 2.0 pulleys.
