ESS E9X M3 Underdrive pulley 6/08-2013

The ESS designed and engineered S65 underdrive pulley kit is a great addition to the M3. This is done by improving power through reducing parasitic drag on the engine from slowing the speed of the alternator, water pump and AC compressor components. Hp Gains are approx 10-20hp depending on condition of car, climate, and other performance products.

For maximum performance, we also suggest pairing with a full exhaust system and performance software.
Product ID: ESS-M3-UDP2013

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