TheTurboEngineers TTE680 BMW N54 Turbocharger Upgrade - Hybrid Twin Turbos for 135i & 335i (E82 E87 E88), Stock-Location Plug & Play, Up to 680 PS

TTE 680 twin turbo upgrade for BMW N54 135i and 335i - direct-fit stock frame power solution

Looking to take your N54 to genuine big-power territory without awkward fabrication or custom manifolds? This TTE 680 pair of uprated turbos is the bolt-in, factory-location choice for BMW 135i and 335i owners who want serious performance, fast spool and everyday drivability. Built in Germany by TheTurboEngineers, these drop-in units deliver up to 680 PS when matched with the correct supporting hardware and calibration. We have supplied and installed this setup for customers and on our own builds, and the response, mid-range punch and top-end pull are outstanding.

Who is this for?

Ideal for enthusiasts seeking a Stage 3 style N54 solution, reliable 600+ bhp potential, OE-style fitment and proven engineering. Perfect for E82 and E88 135i, plus 335i variants running the N54 engine that want a direct replacement upgrade without changing turbo position.

Why TTE 680 stands out

• Real-world performance - capable of 680 PS with the correct fuel system, intercooler, inlets and tune
• Direct replacement - stock frame, stock position, no manifold swaps, no custom lines
• Rapid response - next generation billet compressor geometry for strong airflow and quick boost onset
• High efficiency - special 9 blade turbine wheels for lower backpressure and improved top-end
• Built to last - upgraded bearing pack and precision balancing for long-term reliability
• OEM-like control - genuine actuators and genuine diverter valves included
• Improved wastegate hardware - uprated arm, flapper and bushing for consistent boost control
• Every unit VSR balanced at high speed - supplied with balance results documentation
• Engineered and produced in Germany by TheTurboEngineers

What you will experience

Expect fast spool for the road, huge mid-range torque and strong power to the limiter with a wide, useable powerband. A true street and track upgrade that keeps daily manners while supporting dyno-proven outputs when paired with the right parts and software.

Required supporting parts for installation

To complete the install correctly and protect your investment, the following ancillary items are recommended or required:

• Genuine BMW N54 turbo installation hardware kit
• Coolant feed pipe Zyl. 1-3 for E60 E82 E90 F01 applications (incl. 135i, 335i, 535i, 740i)
• Coolant feed pipe Zyl. 4-6 for E60 E82 E90 F01 applications (incl. 135i, 335i, 535i, 740i)
• Coolant return pipe Zyl. 1-3 for E60 E82 E90 F01 applications (incl. 135i, 335i, 535i, 740i)
• Coolant return pipe Zyl. 4-6 for E60 E82 E90 E91 applications (incl. 135i, 335i, 535i, 535ix)
• BMW N20 N54 N55 replacement oil filter kit (incl. 135i, 335i, 535i, X6 35ix)
• Castrol Edge 5W-30 M fully synthetic engine oil - 8 litres total
• Genuine BMW coolant concentrate - 3 litres total, plus de-ionised water to mix
• 2 inch silicone inlets for the N54 (for example Masata 2 inch inlets for 1M, 135i, 335i, 535i, Z4)

Appropriate ECU calibration is required after installation. Fuel system, high-flow downpipes, uprated intercooler, performance intake system and a healthy engine are strongly recommended to achieve target power.

Compatibility

BMW 135i and 335i models with the N54 engine in stock turbo location. If you are searching for direct-fit N54 turbos, stock-frame twin turbos, N54 Stage 3 upgrade, 600bhp N54 solution or a 135i 335i turbo replacement that retains factory routing, this is the right product.

Upgrade your existing units

You can have your good-condition cores upgraded. Send in your undamaged turbos for inspection and conversion by TheTurboEngineers. The price shown is for upgrading healthy cores only. If damage is found, we will provide a revised quotation after inspection. An engineer’s report is supplied upon completion.

Fitting and aftercare

Professional installation is recommended. MJ Modifications offers fitting, setup and mapping support in Warwickshire. For a fitting quotation or workshop availability, email info@mjmodifications.co.uk.

Quality assurance and warranty

Each turbocharger is high-speed VSR balanced and supplied with a balance certificate. One year TTE warranty.

Lead times

• Upgrade of your existing turbos - typically 3 to 4 weeks from the day your units are received
• Brand new units made to order - typically 3 to 4 weeks from order confirmation

Part numbers

• SW10069
• SW10069-01
• SW10069-02
• SW10069-03
• SW10069-04
• SW10069-05

Pre-dispatch check

To ensure you get the correct fitment, we will verify compatibility before shipping. Please provide your UK registration or the last 7 of your VIN at checkout.

About TheTurboEngineers

TheTurboEngineers GmbH designs and manufactures high performance turbochargers in Germany for street and motorsport use, with an emphasis on precision, reliability and repeatable results.

Search terms customers use

N54 big turbos, N54 Stage 3 turbos, BMW 135i 335i twin turbo replacement, stock frame N54 hybrids, bolt-in N54 turbos, direct fit twin turbos BMW, N54 600bhp upgrade, 650bhp N54 setup, billet wheel N54, 9 blade turbine N54, upgraded bearing pack N54, VSR balanced turbochargers, OEM location N54 turbos, plug-in N54 turbos, 2 inch N54 inlets required, German engineered turbo upgrade, TTE 680 twins for N54, performance twin turbocharger BMW 135i, performance twin turbocharger BMW 335i.