Originally Posted by Slartibartfas

It's my opinion/experience that it's better to start bone stock. Wait until the car becomes the limiter before upgrading. I do recommend a Schroth Rallye 3 harness or similar. That by itself was worth a second per lap during autocross. I was unknowingly losing time while having to brace myself for turns. When I first used a full 5-point harness and racing seat I marveled that I didn't have to use ANY energy to brace myself.