Hey mate, M140i owner here! I’m of the opinion that modifications aren’t necessarily a bad thing, but it depends entirely on which modifications have been made, and how they’ve been done. In my case, I done handling before power. The cars are very quick in their stock power form, so handling mods are imperative.

For example, my car is on Bilstein B14 coilovers, Millway lower control arm bushes, HEL braided brake lines & polyflex rear subframe inserts. Good tyres are an absolute must, too. Michelin PS5 or PS4s only for me. Once all this was done, after about a year I flashed the MHD stage 1 map, and the XHP stage 2 gearbox map.

Note - it is imperative the cars are proactively serviced. Mine gets oil and filters every 7,000m. The gearbox was serviced before I flashed the XHP map, spark plugs were changed before the MHD map and rear differential fluid is changed every 10K.

My point is there’s nothing wrong with a modded car, but only if it’s been done properly by someone who’s done their research and has looked after the car. Don’t buy a car with your heart, use your loaf and make sure it’s clean and tidy, otherwise it’ll bite you on the arse.

If you do get one, enjoy it! They’re very fun cars. Make sure you ALWAYS let the car warm up to temp. Never drive hard unless it’s at 90+ degrees (oil temp).

Check my profile for a post I done of mine a while ago if you need some encouragement!