There is some cars I work on:
Audi 20V n/a - my favorite field. Not because of successive engine, but even contrariwise: get 100hp/l is real difficult. We have n/a 4wd class in our rally-sprint (similar to rally but shorter distance in special stages). And there is only two appropriate models: Audi 20V quattro or Subaru Impreza 2.5RS. About 6 Audis is tuned by me. Two using VEMS. Now Impro to come.
Mazda F 1.5liter. Turbo without any changes inside engine. 0.4bar boost at max torque and even 0.7bar @ high Rpm. Not great success in figures, but was pleasure to tune.
BMW with '99 M3 engine. It runs. But without double VANOS.
Audi 16V n/a.
Opel c20xe.
Volvo 740 turbo.
1.6L 8V VW crossflow. Succesive project: wide powerband from 4500 up to 8500 and 100hp/l
Mithubishi Eclipse gen1. 2L turbo. 4WD
processing:
LADA VFTS replica.
Jaguar XJS V12 with two VEMS. will be alpha-N.
Jaguar Sovereign 4.2L '86
pre 2000 Imprezas Turbo.
Some Audi 20VT
M3 4cylinder!
Mithubishi Galant 4g63 2L n/a
Impreza 2.5RS '99