thats on a rb20 wall thickness on the pipe was 2.5 mm that is more then thick enough the problem with stainless is it expands and shinks a fair bit so on the out side of the weld is the most brittle but if you get 2 years out of a 250 dollar manifold money well spent. i wouldnt high mount a nissan turbo again unless high flowed so much stuffing around for min gain. only reason i did it was beacause i was setting up for a bigger turbo but i poped it so plans sped up. i agree with R31Nismoid just use the log style unless you put a decent turbo on