It took me five minutes to get it off and I can't think of a better first modification for a 12A RX-7 as far as autocross goes. The car is now firmly planted on the ground in turns and quick, tight turns are much easier. I'm now getting 65 second laps where before I would be getting 70 second laps. If your car is stock and you race autocross, do it. Get your hands dirty for two minutes and do it. I'm not guaranteeing you'll lose five seconds but you'll be glad you did.