I've been fully modded for years.
No problems until 55k replaced the turbos out of pocket, they didn't even blow yet. Oh and a abs sensor ($100) Lol other than that nothing.
My gf had a e90 07 335i, from 30k to 149k I think. Never did anything to it other that valve cover gasket.
My brothers m3 hasn't had a single problem in 2 years. Driven harder than hell.
Dad had a e60 550i. Never had a problem.
I also own a V10 M5. Never had a problem except for recalls repaired for free. (6mt probably help a whole lot in e60 M5s)
Saying people would be retarded to buy a n54/55 is something super stupid to say.
You had a lemon or something lol.
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e92 ///M3
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