Doing a titanium downpipe on an r34 gtr with a single top mounted turbo external waste gate. I wanted to hear opinions on autogenous welding titanium. Would it suffice for something that sees heat cycles like a wastegate ? Or would using filler be recommended? From what I know titanium can be welded safely without filler and it doesn’t take away any strength. The waste gate will have its own independent flex bellow s well as the main pipe.