BMW M135i & M235i
Home/ Shop by Make/ BMW/ M135i M235i
F2x N55
78 parts in stock
// The N55 originals

BMW M135i & M235i

The cars that started the six-cylinder hot-hatch revival. The N55-powered M135i and M235i share the F2x platform with the later B58 cars - cheaper to buy, hugely tunable, and the chassis catalogue crosses straight over.

Downpipes & exhaustsIntercoolers & coolingIntakes & charge pipesCoilovers & suspensionBrakes & LSDsECU tuningStylingWheels & spacers
ChassisF20 / F21 / F22
EngineN55B30 320-326hp
Production2012 - 2016
LayoutRWD 6MT / 8AT
F20/F21M135i (5dr & 3dr)
2012-2016 N55B30 320hp (LCI 326)
The original six-pot hyper-hatch. Single twin-scroll turbo, big aftermarket, bargain money.
F22M235i coupé & Convertible
2014-2016 N55B30 326hp
Same drivetrain in the coupé body - mechanical parts interchange with the M135i throughout.
F40M135i xDrive (2019+)
2019-present B48 2.0 306hp
Different car entirely - FWD-based platform, parts do NOT interchange with these F2x cars.
0 parts for BMW M135i & M235iSort: Best-selling
No products found in this collection yet.
// Trusted on this platform
Top brands for the M135i & M235i
// The platform

The smart-money six-cylinder

Before the M140i there was the N55 - and a decade on, the M135i and M235i are the smart money in the fast BMW world. The single twin-scroll N55 takes a map to around 380hp, Stage 2 hardware to 400+, and the chassis parts bin is shared with every other F2x, so upgrades are plentiful and cheap. It's the same rear-drive recipe as the later cars at two-thirds of the price.

The proven upgrade path

01
Stage 1
Map only - roughly 50-70hp gain on stock hardware. The N55 responds instantly to boost and timing.
02
Stage 2
Downpipe, charge pipe (the plastic OEM one is a known failure at higher boost) and intercooler with a matched map.
03
Chassis catch-up
LSD, coilovers and front camber - the F2x nose needs the help once power climbs past 380.
04
Beyond
Upgraded turbo and fuelling through our custom mapping service - 450hp+ builds are well documented on this engine.
// In-house ECU tuning
In-house ECU tuning for the N55
Stage 1-3 and custom mapping for the N55, all done in-house - the map to match the hardware above.
Explore ECU tuning →

M135i & M235i - frequently asked

Do M135i and M235i parts interchange?

Yes - same F2x platform, same N55 drivetrain. Only body-specific items (cat-backs, some trim and styling) differ; each listing states which bodies it covers.

Will M140i/M240i (B58) parts fit my N55 car?

Chassis-side, yes - suspension, brakes, diffs and most styling are shared across all F2x cars. Engine hardware is not: N55 and B58 use different downpipes, intakes, charge pipes and maps. Check the engine code on every listing.

Is the 2019+ F40 M135i covered here?

No - the F40 M135i xDrive is a four-cylinder, FWD-based car on a different platform. Nothing on this page fits it. A dedicated F40 page is on the way.

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.

// Browse the range

M135i & M235i parts by category

F2x Downpipes & exhausts→F2x Intercoolers & cooling→F2x Intakes & charge pipes→F2x Coilovers & suspension→F2x Brakes & LSDs→F2x ECU tuning→F2x Styling→F2x Wheels & spacers→