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I think the JB3 with the low boost map should be fine for long term ownership (next year I'll bank on it).
At least if you have the updated turbo/wastegate parts on your car - my 335 has the early design and they're failing for the 2nd time around...
I can tell you that compared to my chipped 98 A4, the 335 has a much better (and sturdier) clutch and gearbox. And if you take care of the engine (change oil between the factory 15k intervals, wait until the oil is warmed up etc.) it should last well.
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2018 F80 Santorini
2019 Z4 3.0i
2022 X2 M35i |