i know slowboys and turbotrix and there is one other company i cant remember right now.

 

If you're wanting to rev it to 10,000, then go for the 2.1. If not then there is no reason for the extra work. That's one of the reasons I've not gone for the 2.1. Race car sure, street fighter, and weekend warrior, probably not.

Just keep in mind the clutch you're planing on using as well.

 

i cant wait to get it in my car and take it down the track. im highly thinking of upgrading my green to a red. depends on how much money i have.