Performance M
Forge Charge Pipe for N55 M135i F20/F21
Forge Charge Pipe for N55 M135i F20/F21
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Aluminium Boost Tube Upgrade for BMW M135i 1 Series F20 and F21
Transform your 1 Series with this Forge Motorsport aluminium turbo outlet pipe. The factory plastic ducting on the M135i is known to go brittle at the throttle body end, causing cracks and boost leaks. This precision alloy hard pipe solves that weak point with a robust, beautifully machined assembly built for performance tuning and long term reliability.
Engineered for sharper response and reduced lag, this intercooler-to-throttle pipework is a direct fit solution that keeps the original connection style while massively improving durability. It is the ideal reliability upgrade for mapped cars and a smart replacement for ageing OE plastic tubing.
Key benefits
- CNC machined billet couplers and flanges for a secure, leak-free fit
- Powder coated aluminium hard pipe for strength and a durable finish
- Retains the factory O-ring throttle connection
- Compatible with the standard electronic diverter valve
- Improves throttle response and helps minimise turbo lag
- Direct replacement for the fragile OE plastic turbo piping
Built-in WMI port
Latest kits include an integrated water methanol injection boss. Not running WMI yet? A blanking plug is supplied so you can install now and add injection later with no extra fabrication.
Compatibility and notes
- BMW M135i 1 Series F20 and F21 chassis
- Replaces OE pipe part number 13717604033
- Not suitable for xDrive models
Recommended pairing
For maximum results, consider combining this upgrade with the Forge front mount intercooler kit FMKT135F20.
Why buy from MJ Modifications
We have installed this upgrade on customer cars and our own demonstrators, and the feedback is consistently excellent. Fitment is straightforward, the quality is outstanding, and the improvement in boost control and reliability makes it a must-have for tuned and stock vehicles alike.
Professional fitting available
Want it fitted by specialists? MJ Modifications in Warwickshire can install and set this up for you. Request a fitting quote via info@mjmodifications.co.uk.
Looking for this part as an intercooler pipe upgrade, turbo outlet tube, throttle body hard pipe, aluminium boost pipe kit, WMI port boost tube, performance turbo plumbing, or a replacement for 13717604033 on the BMW 1 Series M135i F20 F21? This is the one to choose for reliability, tuning support and long-lasting performance.
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