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The Crown Jewels of BMW Performance. All in One Place.

BMW built the E9X chassis to perform. Then they softened it for the showroom floor, quieter intakes, sloppy bushes, cooling that keeps up with traffic but not with backroads, and an open diff that gives up the moment one tyre loses grip.
We reverse that.
Matt Lewis Racing brings together the four upgrades that turn a capable chassis into a proper driver's car:

  • Ramair — replace the restrictive factory airbox with induction hardware that breathes properly, responds faster, and sounds like a BMW should.
  • Powerflex — polyurethane bush combo kits with Free UK Shipping that remove the factory slop in one go, not piece by piece. Sharper turn-in. Less deflection. More confidence.
  • Airtec — intercoolers, radiators, and oil coolers that keep charge air and oil temperatures where they belong, lap after lap, backroad after backroad.
  • Blackline — helical limited-slip differentials that put power to both rear wheels when you need it most, with Free UK Shipping on installation kits.

No excuses. No compromises. Just the parts that actually transform how your BMW drives.

SPECIAL OFFERS

Stop Strangling Your Engine

BMW built the N52, N54, and N55 to make power. Then they wrapped the intake in a plastic box designed for quiet. Ramair fixes that.

A panel filter is the gateway drug. Swap out the paper clog, drop in a reusable high-flow element, and feel the throttle wake up. Five minutes. Zero drama. Instant grin.

Want the full hit?

A Ramair induction kit replaces the entire intake tract with an aluminium or reinforced silicone hardpipe, and a genuine cold-air feed that actually lives outside the engine bay heat. Your turbo gets the airflow it was begging for, and your ears get the soundtrack BMW deleted.

  • Sharper throttle response.
  • Lower intake temps.
  • That raw, angry induction roar every time you bury the pedal.

Fits E9X models like it was factory, because Ramair actually designs these products specifically for this chassis, it's not some universal "maybe" kit.

  • No remap needed.
  • No CELs.

Just cold air and a heavier right foot.

RAMAIR E9X UPGRADES

Delete the Flex

Factory rubber bushes are soft for a reason: your auntie's daily commute. They're not built for B-roads, boost, or anything resembling fun.

Powerflex polyurethane bushes replace that mush with precision. Every input you give the wheel actually reaches the road. Turn-in sharpens. Understeer backs off. The whole car feels like somebody finally tightened every nut underneath you.

Front Wishbones, Rear Subframe, Anti-Roll Bars, Diff Bushes, wherever your beloved beamer has rubber, Powerflex has the upgrade. Purple for the road, the sweet spot of sharper handling without wrecking daily comfort. Black for the track, when you want every ounce of feedback and don't care about NVH.

  • Sharper steering response.
  • More predictable at the limit.
  • Bushes that outlast the car.

Stop driving around the flex. Remove it.

Powerflex E9X Upgrades

Stop Wasting Torque

BMW built the E9X to deliver serious torque to the rear axle. Then they fitted an open differential that treats grip like a suggestion. The moment one wheel loses traction on a tight corner exit, a damp roundabout, or a hard launch, the diff sends almost all your torque to the slipping wheel. The loaded outside tyre sits there doing nothing. The power you paid for disappears into wheelspin and DSC lights.

The factory diff is the bottleneck nobody talks about. It is why your 335i can roast the inside wheel in third on a damp road while the tyre with all the weight and grip is ignored. Every time the traction control blinks, that is torque being thrown away.

Blackline replaces the open diff with a helical gear limited-slip differential with a 5:1 torque bias ratio. Under power, the gear mechanism automatically biases torque to the wheel with the most grip, up to five times more than the inside wheel. The outside wheel drives. The inside wheel hooks up. The chassis stops fighting itself and starts putting the power down.

  • No clutches to wear out. No plates to replace. No servicing.
  • Predictable, progressive lock-up that behaves on the commute but transforms a corner exit.
  • Both rear tyres working together, not one wheel spinning while the car goes nowhere.
  • Traction you can feel, wet or dry, without the abrupt on-off behaviour of a clutch-type LSD.

Blackline E9X UPGRADES

Keep Your Cool

Heat is the enemy of power. Stock cooling is a compromise, fine for the daily grind, but it leaves headroom on the table when you're on it. Airtec builds the stuff that actually fixes it.

Airtec Uprated Intercooler

  • Bigger bar-and-plate core with more surface area, better thermal transfer
  • Cooler, denser charge air with less heat soak, more consistent power
  • Direct bolt-on, no drama and no custom pipework
  • Essential for remapped N54/N55s or anyone who uses the boost properly

Airtec Uprated Oil Cooler

  • Brings oil temps back into the safe zone under sustained load
  • Protects bearings, rings, and turbo when you're asking everything of them
  • Not about peak power, it's mechanical insurance
  • Direct-fit kit, proper peace of mind for motorway hauls and track sessions

Airtec Uprated Radiator

  • Larger core volume + improved flow over stock
  • Handles coolant temps when a tuned turbo is working hard
  • Direct-fit swap, no bracket faff and no custom plumbing
  • Complete the thermal package: intercooler + oil cooler + radiator = zero weak links

AIRTEC E9X UPGRADES

Why These Upgrades Matter

You can fit one upgrade and feel a difference. Fit all four, and the car changes character.
The E9X chassis starts capable. But factory compromises mute its soft bushes, let the suspension move in ways it shouldn't, heat soak pulls timing, the open diff sends power to the tyre with least grip, and the intake sounds like it was designed for a rental fleet.
Fix all four, and you don't just make the car faster. You make it coherent. Throttle, steering, temperatures, traction, everything starts working together.
Right now, two of those fixes are even better value:

  • Powerflex Bush Combo Kits — multiple packs bundled in one kit, with Free UK Shipping
  • Blackline LSD Installation Kits — including Motul Gear 300 diff oil and a full set of diff seals, also with Free UK shipping,