Carl, I have a gas roadster#832 that runs El Mirage all the time, It has rear disks only good sized and a single parachute that is sized for 230mph and about3200# vehicle weight. It takes all of the shut off for me to feel comfortable to turn out. This last year my speeds were 202-210mph and the roadster is now 4400#approx. I did go out the back door once last when I had a pilot chute failure, only buy a 80' , that was 206mph and all brakes, could of stopped inside, I just could not make myself lock up a $1500 set of mickeys. This years remedy is a new larger Stroud chute ! Hope this helps. Eric