@Grant Pratt titanium is back purged. Nice and shiny on the inside. Thanks for the recommendation. Sometimes I feel guilty pricing my stuff or like imposter syndrome.

@Grant Pratt it did get some slight discoloration on some of the welds on the inside. Not really sure why. I even used the heat tape stuff on some joints to help.

@Grant Pratt I normally do stainless. Customer requested titanium. Believe it or not he already has had a titanium unit on there for years. He is switching turbo set ups and wants a new one. (The greyish color is from heat wrap) And ok. Your logic makes sense. I have heard from a few sources that titanium specially is one of the only metals that can be welded autogenously without compromising strength. But wasn’t sure if that sounded right for something like a down pipe and waste gate. I’ve tried my hand at it and was able to get good pen without a concave profile.

@Grant Pratt honestly, its hard to put into words. im ignorant to a lot of the tools used in fab and at times it feels this info is gate kept. im teaching myself now how to get a good finish on material before i weld stainless. that clean matte / semi polished finish. also jigs for cuts and putting holes into piping or something like a wastegate return. and some off the practices like: when and when not to use a flex pipe for a waste gate return. just stuff like this im struggling to find insider info on