The aFe Silver Bullet throttle body spacer (part 46-31006) is a billet aluminum spacer for the 4.8L V8 in the BMW 5 Series E60. It is constructed from 6061-T6 billet aluminum, precision machined for light weight, high strength and a close fit and finish. Adding the spacer lengthens the intake track, which the manufacturer says increases intake air speed and throttle response. Its serrated/helix entry creates turbulence at the manifold while eliminating the annoying whistle found in other helix-only throttle spacers.
Against a stock setup or a plain spacer, the case for this unit rests on its airflow design and machined construction. The manufacturer lists maximum gains of +10 HP and +14 lbs. x ft. of torque, though those figures are presented as ceilings and the test conditions should be confirmed before relying on them. Shoppers searching for a BMW E60 4.8 throttle body spacer, N62 throttle response upgrade, or a quiet serrated helix intake spacer will find this design addresses the whistle complaint directly. Fitment listings differ across sources, with some including earlier 545i and 645Ci applications and other models, so confirm your exact VIN and engine code with the manufacturer before ordering.
The manufacturer says the serrated/helix combination is designed to reduce the intake whistle that helix-only spacers commonly produce.
The manufacturer lists up to +10 HP and +14 lb-ft of torque as maximum gains. Confirm the test setup with the manufacturer before treating these as expected results on your vehicle.
