Last year when I had to redo my supercharged 3.3 when it snapped a timing belt. there is a company in California that specializes in 300zx performance. I called them and they custom grinded me a set of performance cams for about $400 and I had to send them back the old ones. its a little rougher idle but wow a lot more grunt and go. im running 6" lift and 33" tires and it will now spin them with ease. ill see if I can find their name for you if I still have the paperwork.