Typically have to weld the part in the purge chamber. Oxide is a bitch. Biggest pain is EVERYTHING has to be specific for the Ti. All tooling, cutters, jigs, etc. No cross contamination. I have a few torches just for the crap. Aside from that it’s normal for me.
20wrx09, I know you said the muffler doesn’t drone but if you remove the cat it likely will a bit. It does on my car and grantid yes my car doesn’t have a turbo to muffle the noise but it does drone a bit w/o the baffled/silencer tip in place. I have twin 2.25" pipes going right back to that can, with nothing more than a pair of ~18" resonators in place.
Maybe stuff a high flow cell unit in the exhaust if/when you mod the DP.