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Evosport's performance under drive pulleys give your M3 add power and give your car extra pickup!
This kit comes in two versions, the performance and audiophile. Both kits will replace the water pump, power steering and alternator with higher performance underdrive pullies to provide a 10-20% reduction in driving the vehicle's systems resulting in a dyno tested 12HP gain.
The audiophile kit is designed for customers with high end aftermarket stereo systems that put added strain on the alternator from audio amplifiers. Given this higher strain, you will not want to underdrive the alternator so we simply lighten that pulley rather then underdrive it.
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BMW 
