S85 Silicone Throttle Body Coupler Set

The NRW Design silicone couplers are built to replace the OEM rubber pieces that eventually harden, crack, deform, and start leaking. BMW treats the originals as wear items - this is the same OEM-style shape, made from synthetic silicone so it holds up long-term on both street and track cars.

Key benefits

Synthetic silicone construction (OEM-style fitment, improved material)

Handles high heat and very low temperatures without going brittle

Helps prevent vacuum/boost leaks caused by aged OEM couplers

Boost-approved and tested on NA + 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

Availability

S85 boots are currently in production and will be available soon