Nasa TT is a lot faster than group 4 and safer. Group 4 is fun and good for the ego, but it is a little scary when there are some that just moved from group 3 and others that are seasoned in high HP monsters.
I don't know of any insurance.
Check out the lap records in your class and track, which will give you a idea of speeds. You will need to run Hoosiers or similar tire to be competitive. Suspension, weight loss, and tires are the best points to take. You probably have some weight to lose since the weight listed is with driver.
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