The aFe Silver Bullet Throttle Body Spacer BMW 325i (E46) 01-06 L6-2.5L is an aftermarket performance part designed to increase horsepower and torque in BMW 325i (E46) 01-06 L6-2.5L engines. The throttle body spacer is constructed from CNC-machined billet aluminum and features a unique helix bore design that creates turbulence in the air flow to promote superior atomization of the air/fuel mixture. This helps to improve throttle response, increase power, and improve fuel economy. The spacer also features an anodized finish for corrosion resistance and a long service life.