Well my car is streetable makes more then 600 hp and has a viper T56 six speed and I did not cut the floor or firewall out I know that it's not up to the task of taking out a stielow built Camaro but does handle very well. Once I free up time from customer cars I plan to beet the GM boys at there own game by using there products. 1) my car is a early a body detroitspeed mustang front supension so I will be keep my factory rails but will be tied into my cage 2) detoit speed Camaro rear 4 link all this without cutting my car to pcs