The B58 giant-killer
When BMW dropped the B58 into its smallest bodies, it created the modern giant-killer: 340hp, rear drive, and an engine that shrugs off another hundred horsepower with bolt-ons and a map. Stage 1 alone takes an M140i past most period M cars; downpipe, cooling and Stage 2 put it firmly into supercar-baiting territory - while it still does the school run. Add an LSD and suspension and the chassis catches up with the engine.
The proven upgrade path
M140i & M240i - frequently asked
Do M140i and M240i parts interchange?
Almost entirely, yes - they share the F2x platform and B58 engine. Body-specific parts (cat-backs, some styling) are listed per body; everything engine and chassis-side fits both.
Do M135i/M235i (N55) parts fit?
Chassis parts - suspension, brakes, LSDs, most styling - carry over from the earlier N55 cars. Engine hardware (downpipes, intakes, charge pipes, tuning) is B58-specific: check the engine code on every listing.
What's the best first mod?
A Stage 1 map - around 60-90hp on an otherwise standard car. After that, downpipe and charge pipe with a Stage 2 map, then an LSD before you chase bigger numbers.
Do you offer ECU tuning in-house?
Yes - Stage 1-3 and custom ECU mapping are done fully in-house. We don't currently offer parts fitting, but we're happy to advise on your install.