dont really care about the light its already on throwing a cat code. Im just talking about mpg and how it will run

 

Got a friend just told me on his gtp with coldair, one heat range lower on plugs, wires, 180 drilled tstat, 3.4 pulley, ubend delete ported s/c case and a zzp tune has its been great for years and runs 13.9's in 1/4. What so different with his car?

 

Ported SC case- porting on the M90 can drastically reduce outlet temperatures, also could be a little on the freak side as far as KR goes. Has your friend actually scanned and confirmed 0* KR? Or is he just basing that off the fact that it runs ok, and does 13.9's? It does sound a little light on the mods for 0 KR, but not totally impossible- you could get your friend a ported M90 instead of rockers- but its more money. I'd still do a powerlog or headers though because the factory front manifold blows.

Seems like you're really trying hard to swap pulleys on it- have you even scanned the car yet? Ask any hardcore L67 person, and they'll tell you that square 1 is to scan the car for KR and see where it's at. If he's got only a couple degrees of KR now, then you know you wouldn't have to do too much to get to a 3.5"; if its running 7-8* of KR, you know its going to be a real pain.

 

he hasnt scanned anything just zzp computer. ive known him for 3 years and its been together that long. lol

 

As I said before, as long as its still on a stock pulley, and he's not planning to change it soon- its not really a big deal how much KR it has- because I don't think I've never seen a chipped piston from a stock pulley.

Only time its a big deal to scan is if he's seriously considering swapping pulleys, then its a good idea to find out where you're at with KR.