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I was wondering about your numbers Riick.
According to Burger a stock N55 in a 135i makes 288hp/329 tq. So +30hp and +26tq vs a tuned N20. Add the JB+ and the N55 goes to 315/356 which is 20% more power than a tuned N20. I don't think you will be out running a 35i.
The N55 after 2013 gets an improved water pump, the coils are good, the HPFP is good, really nothing to worry about other than the serpentine belt and tensioner. The N54 was a nightmare and the N20 class action suits continue.
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