Safety stuff is a must. Even if you don't do a seat you will need a helmet and a neck restraint. I you are not going to get a harness and harness bar, 4/6 point roll bar then the best neck restraint is the Simpson Hybrid.It is $1k but worth every dime. I personally would not do a harness bar and would get a 4 point roll bar. You can get one built and welded for about 1,200. A can't tell you how much a racing seat increase your experience and assist with your driver mod. It is very hard to carry speed through turns when you are holding on to the as an oh Jesus bar and trying to brace yourself with your legs instead of driving the car.
Like I said, racecar=rabbit hole. You got time on some stuff but don't wait on the safety stuff. As you get faster you will want and need many of things that been brought up unless you are content doing parade laps. I know you...you are one competitive guy so you will want do time attacks and time trials at a minimum.
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