Hey guys, don't want to hijack the thread but I my Opel has a 8.50 IHRA cert on it right now and was told all I needed to make it a 7.50 cert was the two bars behind the seat that goes down to the floor. Does anyone know what size of piping this should be. I am using mild steel and did not know if it had to 1" 5/8 or not. Thanks in advance for the help and or advice.
Chris