I have a 1999 excab with a lot of bolt on's but I'm still running through the stock exhaust, my best time to date is 9.17/14.33 at 4250# & close to sea level, I have switched from drag radials to Toyo 29x9" slicks & I'm still not happy with the traction, I was reading in differant forums about Cal-Tracs & how happy people who were running them were, My question is to other R/T owners who run these would you pass along any information on what adjustments worked best. Thanks Lynn