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While not explicitly required
The cooling unlocks some significant additional power when paired with the stage 3 DINANTRONICS Performance Tuner (where applicable)
• CAT6 Map1 with R
No matter if the valve is open or closed the exhaust gasses make their exit via Dinan's signature enlarged
Dinan Underdrive Crankshaft Pulley Kit - BMW M5/M6 RADG While not explicitly requiredDinan's lightweight billet aluminum crankshaft pulley underdrives each of the accessories by 13 percent, reducing parasitic drag on the engine for a 6 HP @ 8000 RPM and 4 lb ft torque @ 8000 RPM gain on a stock vehicle. The Dinan underdrive pulley retains the factory harmonic crankshaft damper, eliminating vibration that might otherwise damage the crankshaft. The kit includes all of the necessary mounting hardware, lightweight pulley, and shorter