Once you're finished with your breathing mods (intake/exhaust). Get a tune. This way you only have to pay for it once. When you get your tune. Have them fix the throttle response and reset when the cooling fans come on. Don't let them raise the rpm limiter.
For an intake. I have the Stillen G3. The clutch helper spring works. Got of those. Also get an oil cooler. I have the Z1 34 row unit.
Read through my journal to get an idea on which way you want to go, and which things that you might want.
