air to air seems to have a bunch of ~3" tubing from the turbo running out the a H/E and then back to the intake...but I'm not sure cuz I haven't seen the whole system

if you're handy with OA, you'll pick up tig in a lot less than 40 hours. 40 hours of torch time is a LONG time for non-production work. just grab a rod and feed it through your hand while you're watching tv for a few nights and you should be pretty well set.