day 4 of trying to do this. you need two people or a vice bench in order to get the 90 degree flixble on the 4" pvc thin wall. or else it wont go on and you will end up hurting yourself. just an fyi the pvc pipe broke 3 times so lucky i got 5 feet of it. and the 4" roofing peice for the fenderwell just 3 times of trying that and the measurements were off for my car.