Some one help me
#3
a4 or m6? but i mean really depends on alot of diff things i would say go race see how high u can launch it start small and increase the rpm each launch til it just blows the tires off then u should know where to launch and where not to.
#4
I agree with LsXMARO, the best way to figure out is to go to the track and test it out. I would start off low and work your way up until the tires blow off and or you 60 foot times don't get any better