hey, installed a front mount on my mates r33 gts-t a few months ago. he had the same problem with the boost rising. so we had to put the niple in so he could put a bleed valve in, but u dont have to weld it, all we did was go down to a auto parts store (repco) and picked up a brass nipple that was the right size for the hose, then drilled a hole that was smaller then the thread of the nipple, and because the brass was a harder metal it simply self taped itself into the hole, we also used plumbers tape at the same time to create a better seal. As for the plumbing of the bleed valve hoses i can't remeber exactly what we did, but i rembered that we replaced the stock hoses with some silicone tube because the stock stuff has restictors in them. i'll check with him and get back to you.