I've posted the same at the Hot Roads Forum:
I'm buying,may be in a couple of days, a 1992 500E 67k miles, drives and looks great, but my concern is about the Renntech mods that this car have: Chip (starts in first), exhaust system and (this is the big one) engine heads. About 90 extra HP.
My question is: Is this car going to last and to be as reliable as a "stock" one?

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400E 1993