I used the engine from an 86 5ks non quattro. The hardest part was researching the electronics and hook ups. I kept the larger clutch, am now doing engine mounts (i guess they're not used to all that HP!) I kept the CIS-E, since i like it better than pulsed injection. Also, i didn't have to change the wiring harness! if you want more details, let me know, i'll be glad to help! Chris Locke