the cheap xs power dump valves are better than bailey and forge imho, it took 32psi on the t34 before the xs power dump valve started to leak, just needs a stronger spring and you can take the xs power ones apart easy enough, i used a bailey first ,but it leaked, they ex power do singlke and twin trumpet and my single is very load, i will use it, although the sxoc seem to be against them and say they are

,but i'd rather protect the turbo, there although there will be nothing

about 600bhp.