Had a euro M6 with dinan treatment and 5 speed. For whatever reson they didn't do the vallve spring upgrade as suggested/mandated for longevity. Thing would bump the rev limiter easily in first 4 gears. well over 300 hp at the wheels. A valve spring let go....cost to rebuild motor was more than the car would be worth when I got it back. Paid 9500 for it in '97. Sold it for 3K with blown motor in 2000. Best 6500 I ever spent on a car.
It was my favorite car ever, ever, ever...EVER.
That is until it handgrenaded.