Protect your BMS JB4 or Stage 1 tuner on BMW F-chassis cars with this CNC-machined billet aluminium enclosure. No plastic, no casting - just precision-milled US-made aluminium.
Features a weather-resistant sealing ring for reliable daily driver or track day use. Drop-tested and vibration-proof, it’s built for real-world UK roads and spirited driving.
Fits all BMS JB4 and Stage 1 tuners - plug-and-play
