Wire tune, unless gearbox isn’t done right. Mine does 479/670nm and get below 4.0
3.7 but I only miss active cruise control (wasn’t available from bmw in first days) later it comes as part of package I’ve got on car but I pay low tax as I bought it before 30.03.2017 (from 01.04.2017 I would have to pay premium tax for up to 5 years) haha.
For gearbox in 540i I recommend mission tuning. You don’t have to drive to them just you will laptop and 30 dollar cable of eBay . (massive difference in gearbox) had to adjust to car power after gearbox tune. It was ohh fuck, pulls as crazy in mid section right to the top with lowered springs and (6x geometry adjusts) it’s like sticker to road at speeds 120mph right to top speed speed 200mph.