The NRW Design silicone plenum / throttle body couplers are a long-life replacement for the OEM rubber couplers that commonly harden, deform, and start leaking over time. BMW treats the originals as wear items - NRW’s goal here is simple: keep the OEM shape and fitment, but upgrade the material so they don’t age out.
What’s improved
Synthetic silicone construction (OEM-style shape, upgraded material)
Designed to handle high heat and very low temperatures without going brittle or losing structure
Boost-approved and tested on NA and supercharged setups
What’s included
S65 kit: 8 couplers + 8 worm clamps
Clamp notes
Included clamps replace the lower one-time-use clamp
The upper OEM worm clamp is reusable and fits these couplers correctly
