Our carbon fiber plenum for the BMW S65 is a work of art:? Made from multiple layers of pre-preg carbon fiber, baked in an autoclave, and adorned with custom billet fittings made in our machine shop, we believe this is the best looking S65 carbon fiber plenum on the market.? Standard version is glossy, but for additional expense, available in matte or "show" finishes.? But it is not all show and no go:? By eliminating the stock plenum's topside "ribs," we not only created a cleaner look, we enhanced plenum air volume and made sufficient room for cleaner air flow into the? included billet straight velocity stacks. Multiple in-house dyno runs on our Dynojet XLC424 showed a consistent increase of 10ft lbs. of torque below the 5250 rpm crossover point and a much linear torque curve when compared to back-to-back runs with the stock plenum on the same car, same dyno, same day.? With concerted tuning and a better than stock engine, we believe the gains would be even higher.? That said, the beauty and intoxicating intake sound from the plenum alone makes it a must have.
