well i put my car into hardcore racing at slacks creek today for my 100K service. got the usual stuff done, timing belt, water pump, diff oil, gearbox oil, seals, bearings, etc
anyway, things that were stuffed:
- water pump: all the teeth were chopped off. somehow it was still pumping water, but i doubt it would have for much longer. the mechanic said it was the worst water pump he had ever seen
- coil packs: i was getting misfires after coming off mid-high boost. turns out both packs had cracks, and 3 electrodes were damaged to all buggery. only 2 were in a "ok" state
so after that was all fixed/replaced a dyno run/tune was done (dyno run done before service too)
very nice increase. its a helluva lot smoother now, the gearbox is way more nicer to shift now and now i know the car is mechanically sound again. it wasnt cheap though, the coils bloody cost a lot (2nd hand as well).
so the moral of the story is: if your due for a major milestone service, go and do it. u might not know what parts may be at their limit.