I've seen video of an ls1 evo. Don't do it, go with the 4g. As ben stated you could probably hand 7g's to JP and have him turn the car into an animal while being fairly generous to him.
As said I'm selling a Shoei Hayabusa Helmet in blue/silver scheme - size XL. It is completely free of blemish and has never even been worn. These helmets go for over 500 dollars new and I'm asking 350 FIRM.
http://www.columbusracing.com/forums/picture.php?albumid=24&pictureid=2186