I think Jason has stage 4's but i'm not sure. They dont get much bigger unless you spend over 2 grand. The DR's hopped on me when i hit second. I think that is what broke it. Probably going to sell them and buy 26x10 slicks. I've decided to sell the quaiffe and put a spool in it. I'm also going to just replace the ring gear. I dont want to take anymore chances. I wasnt to happy with my last time at the track.