A 90 BMW 325i that went through with first an S52 from an E36 M3, then an S54 from a 2006 Z4M. Installed the 6 speed and 5 lug suspension as well with fully adjustable suspension and 400w to main speakers, 600w to sub, used MMATS and Audison. Sold it on Bring A Trailer as the racing scene died here, and it was no fun to drive when not on the limit. It caused me to have aggressive driving, and as an instructor, I can't have that. So now I am captain slow with the 4runner without a care in the world.
Prior to this had an 88 E30 with M50 swap, Audi A4 (terrible to work on).
Youtube build playlist click here
With the older S52:
Then with the S54: