I broke a Mark Williams 300M output shaft! it was an 18 spline shaft and I twisted it about half a spline and it ran fine for 2 years like that but at the begining of last year . . . BANG . . . followed by a 600+ hp front wheel drive burnout (I was running a custom spool in the center diff.) It was not at the track although I am sure the damage was done there. I run solid motor mounts, ss transfer case housing, cf driveshaft, and street tires. I launch my car by reving to 5000 and swiftly lifting my left foot (rps carbon-carbon) as I stomp the gas to the floor. My fastest 1/4 mile was 11.2@134 with a 1.8 60 ft. I havent seen a 1.6 60 ft. since I changed from dr500 to dr800 turbos.