The aFe Silver Bullet Throttle Body Spacer kit (MPN 46-36007) is built for the VQ37VHR 3.7L V6, which runs two throttle bodies, so the kit ships as a matched pair with gaskets and hardware. The Serrated/Helix design creates air turbulence in the intake manifold. Expectations should stay realistic: owners on user forums who dyno-tested spacers reported no measurable gains, and attributed apparent improvements to a cooler plenum during installation, so the case for this part rests on low-cost, bolt-on airflow work rather than a guaranteed power number.
Compared with the stock setup, the appeal is a simple bolt-on swap that keeps the factory intake architecture in place. The manufacturer's install sheet indicates the spacer is designed around the stock intake system and that aftermarket intakes may need modifications, so anyone running an aftermarket intake should verify clearance first. Published year ranges for 370Z applications differ, so confirm your VIN before ordering. Shoppers searching for a 370Z throttle body spacer, VQ37VHR dual throttle body spacer, or G37 throttle body spacer install guide will find this part matches those applications.
The manufacturer's install sheet lists two throttle body spacers, two gaskets, and eight M6 x 80 mm bolts with matching washers, which covers the VQ37VHR's dual throttle body layout.
The manufacturer specifies that the engraved side of each spacer faces the throttle body, with the sticker side facing the other direction.
The manufacturer states the spacer is designed to fit the stock intake system, and that some modifications may be necessary when used with aftermarket air intake systems.
The manufacturer's install sheet calls for a basic metric socket set, 10 mm and 14 mm sockets or wrenches, a 5 mm hex key, and a flat-head screwdriver. For vehicles with a strut tower brace, mark the location of the strut tower's adjusting nuts, then loosen and remove the strut tower brace nuts and bolts. Next, loosen the air inlet tube clamps and remove the tube, then remove the OE throttle body gasket after taking out the cap bolts. Do not remove the OE o-ring on the intake manifold. Set the spacer between the intake manifold and the throttle body with the engraved side facing the throttle body, then reattach the air inlet tube. Work one side at a time so the two throttle bodies stay matched, and make sure each gasket sits flush before tightening. The manufacturer does not publish a difficulty rating, but the steps involve several intake components, so allow extra time for the first attempt.
