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Only thing I'd be worried about with tuning the M135i is the gearbox. Both the manual and auto are rated for a continuous 450NM which is the standard engines output.
The manual was used in the 1M which could output 500NM on overboost but this was only in certain gears, when meeting specific parameters for short periods of time.
I've seen some modified cars outputting 550NM.
Some models are not an issue though, it's been mentioned before but the 116i is the same as a 118i except for the software and a small £250 exhaust section. The manual gearbox is the same but has slightly different final drive ratio, the auto uses the same box as the M135i so no issue there.
Cheers
Lee
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