OE BMW N54 Twin Turbocharger Replacement Kit Pair | Fits E82/E88 135i, E90/E91/E92/E93 335i 335is 335xi, E89 Z4 35i 35is | Wastegates & Manifolds Pre‑Fitted | Direct‑Fit OEM Spec

Factory‑spec N54 Twin Turbos Replacement Set for BMW E82 E88 135i, E90 E91 E92 E93 335i 335is 335xi, E89 Z4 35i 35is

Bring your N54 back to crisp, stock‑feel performance with this complete twin turbo set. Supplied as a matched pair for the front and rear banks, each unit arrives pre‑assembled with the wastegate actuator and integral hot‑side manifold for a true bolt‑on swap. Expect fast spool, smooth boost delivery and fresh reliability without hassle or guesswork.

Ideal for owners chasing a straight replacement on tired, smoky or rattly originals, this kit is the clean solution for E82 E88 135i, E90 E91 E92 E93 335i 335is 335xi and E89 Z4 35i 35is. Original‑equipment specification fitment means no custom fabrication and no mapping required when replacing like for like.

Why this twin turbo set is the smart choice

• Direct swap for the N54 twin‑turbo straight six with factory‑spec geometry and flow
• Actuators and cast exhaust manifolds are already mounted for an easy install
• Restores OE drivability, rapid spool and sharp throttle response
• Perfect solution for wastegate rattle, smoking, whining or boost creep on worn units
• Like‑for‑like replacement so no tune is needed when installed on a stock vehicle
• Trusted in our workshop and consistently rated by customers for fit and performance

What you receive

• 2 x N54 turbochargers to OE specification - one for cylinders 1 to 3 and one for cylinders 4 to 6
• Integral turbine housings with cast manifolds pre‑fitted
• Pre‑installed wastegate actuators for each bank

Recommended install parts and service items

Please note: for a trouble‑free job, replace lines, seals and fluids during installation.

• Complete turbo fitting kit for N54 - gaskets, studs, nuts, seals and crush washers
• Coolant feed pipe for cylinders 1 to 3 and coolant feed pipe for cylinders 4 to 6
• Coolant return pipe for cylinders 1 to 3 and coolant return pipe for cylinders 4 to 6
• Fresh oil filter kit for N20 N54 N55 applications
• Engine oil 5W‑30 meeting BMW LL‑04 spec
• BMW coolant concentrate plus de‑ionised water
• Optional: upgraded silicone inlet hoses for N54 to improve flow and ease of fitment

Vehicle fitment

Engine: BMW N54 twin turbo inline‑six

• 1 Series
  • E82 Coupe 135i
  • E88 Convertible 135i
• 3 Series
  • E90 E91 E92 E93 335i, 335is, 335xi xDrive
• Z Series
  • E89 Z4 35i and Z4 35is sDrive35i sDrive35is

Professional fitting

We strongly recommend installation by a specialist. Book your N54 turbo swap with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Compatibility check

We will verify fitment before dispatch. Add your UK registration or the last 7 of your VIN at checkout so our team can confirm suitability for your 135i, 335i or Z4 35i.

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