I have a 2003 ZX3 with a roush turbo kit running 7lbs. It has a set of 40 dollar spark plugs but just with the 2.0 with the turbo i was wondering what i would run in the quarter. I just dyno'd it last week and it put down 167hp to the wheels. It does need a custom tune but what would do the most for it!! Thanks for the info.