My car's originally a 2 litre but a few mods have pushed the power up to a respectable 172hp on the rolling road; up 22 from its standard 150 (or 147 as it was on the rolling road pre mods). I kept the 520i exhaust as it's pretty unrestricted, same as the 525 one but with a single pipe...it's slightly misleading...
I'm gonna add a 518i badge to my car once the 2.8 litre's been thrown in around early April...should be interesting...haha!
I can't imagine not modding my car; I've done some mods, like the illuminated centre console, door courtesy/puddle lights, Air Horn (haha i'm not joking!), chip, 2.5L exhaust manifold + S.S Straight through exhaust, kept the oem back box, de-badge...
I just don't see any fun in having a car if you can't personalise it and mod it how you want it to be.
I like your E34!
I had years ago an E34 M5 3535cc, can't forget it!