Well a buddy and I installed an exhaust takes about 2 hours without a lift in a poorly lit garage with crappy tools. Retuned it in 30 seconds with AP (when I switched to opensource months later that took maybe an hour).

The uppipe and ewg is much easier to do with a lift but again can be done with basic tools, especially since its sounds like you have a stock turbo you can get a plate so no welding is required. Again I dont think this would take more than a few hours... take bolts off put new piece in put bolts back on.

I'm not trying to belittle you but I would have left BVP the first time they started to complain about not having this or that or needing some "special" part. Dude what you have is not some world record off the wall setup. There's probably 2, 16 year old kids somewhere right now installing/tuning what you have. There is NO, and I mean ABSOLUTELY NO reason they should have had a problem with this. It blows my mind how somethings they touch turn to gold and others seem to turn to complete crap. I just dont want to roll the dice with them. I'd rather have only myself and/or good friends to blame not some guys that dont give two craps about my car.