Gentleman I am putting a 86' Turbo into my 87' Audi 4000. I am getting more specs on the motor tomorrow but I know the engine has a upgraded/bigger turbo. But if anyone knows someone that has does this or has tips please let me know!

 

Not going to fit unless you move the trans back several inches (and I don't think you can move it enough). The 10v engine barely fits in a 4kq and it's about 23-24" long. You have about 25" from the trans to the grill/bumper of the Audi. The 951 engine is 26" from the bellhousing to the end of the water pump (even longer with a the hose on it). I believe the crank pulley is even longer. This also doesn't account for an adapter that you'll need to bolt the 951 engine to the 016 trans in the 4kq.