Kittens of my sister’s cat. I just get happy every time I see those little turds 😃 Very, very, very ( one for each ) cute !!! My Russian Blue used to play fetch all the time. Her favorite toy to fetch was either a book of matches, or a folded up card of some sort that was the same size. I could fli...

Great in assembly settings, like a factory.
Not so great in everyday real world settings. And not re-usable. Might as well use a zip-tie.

^ I think he's just doubling down, DIN....

My thoughts are with you.
How we treat animals in this life, determines our place in the next.

Got to use my new wheel cribs - Love them ! I needed to change my downpipe and exhaust, as well as the exhaust flange on the turbo, and these made the job much easier. I could spin around on the creeper without hitting any jack stands, and these actually bring the car up about 2" - 3" high...

But of course 3" screws from both directions, whenever possible. Thought about glue, but I think that would be over kill, as most everything is downward force anyway.

Welcome !
IPD claims that you'd be at apx 275hp just with their tune and turbo back exhaust, so with your other mods I'd think you'd be a few over that.
I would caution you that " one thing leads to another " when it comes to mods.

I had issues with this, except with the yellow accessories block. I had harvested some male prongs from other plugs, but I couldn't get them to go into the yellow block. Ended up splicing into the wires just before the block instead.

I can't speak as to the M56, but I pulled Sveedy's engine out from the top while leaving the auto trans in place. Had no problems with it.
I know others pull both both out from the top while still connected, but I felt it would be easier to leave the trans / linkage etc alone.

I would think that any of the older "R"s will go up in value more than the turbos, and certainly more than the NA.
Maybe you could knock him down a little on price, depending on service records etc.