An underdrive pulleys for the 350z will improve the horse power and torque performance. By just adding the underdrive pulleys your horsepower can jump to 5 to 10 more horse power with the performance pulleys. Underdrives pulleys are aluminum with properly broached and includes the timing mark for a balanced OEM quality fit. The underdrive pulleys are then media blasted for a satin silver finish and lasered. The underdrive pulleys weighs less and with a smaller diameter increases power and performance. Overall driving impression is an increase in throttle response during acceleration. The entire power band gains performance and drivability remains the same. The Underdrive pulley will give you the extra power you desire. Performance underdrive pulleys are available individually as well as in Unorthodox Racing's Ultra Series pulley sets. Accessory pulleys for most applications are stock diameter. Unorthodox Racing's main reason is because all Unorthodox Racing's under driving is done with Unorthodox Racing's Underdrive pulleys. This provides maximum weight loss at the crank where most of the horsepower gains are found. It is important to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for every day driving. The Underdrive pulleys are only 1 pound 5.2 ounces, compared to the stocker's 6 pounds 3.0 ounces. The alternator pulley is 3.0 ounces, while the stock measured 6.5 ounces. And the water pump pulley came in at 7.6 ounces vs. the stock of 14.0 ounces. That's a total weight savings of 5 pounds 8.2 ounces. On the dyno, the reduced weight, along with the pulley's 15 percent underdrive design, resulted in a gain of 6.0 peak hp as Peak output checked in at 244.9 hp. At 5500 rpm, we witnessed a gain of 10 hp.

• Real HP & torque gains across entire RPM range, tests showing up to 10hp
• Performance underdrive Pulleys one of the highest HP/Torque per dollar gains on the market
• Performance underdrive Pulleys better than OEM belt fitment & alignment

If you like to learn more and improve the performance on the Nissan 350z with Underdrive Pulleys please visit us at 350zEvolution.com.