I had a '94 9000 2.0 LPT CSE chipped by Hirsch.
From standard 150 BHP up to 215BHP.
Had her enhanced at 55K and ran reliably up to 97K when I sold her. (That was a sad day, but needed a smaller car, it was made easier as I took delivery of a brand new Mistsubishi Galant VR-4 pushing out 350 BHP later the same day, well it's a bit shorter and narrower!)
New owner is very happy with her and has reported no problems as yet. The old girl is now 107K young and still running fine.
In fact when I had her she ran better chipped, smoother and more reliable then when she was standard. I do miss her as the VR-4 comes with 'race-me' body work and all the NOVA-BOYS do try it on, and we can't have that!