The aFe Silver Bullet Throttle Body Spacer (46-36008) sits between the intake manifold and the throttle body on the VQ35DE 3.5L V6 in 2003-2006 Nissan 350Z models. aFe builds the spacer from 6061-T6 billet aluminum, machined for light weight, high strength, and a tight fit. aFe lists a claimed gain of +8 HP and +11 lb-ft of torque, but those are the manufacturer's figures. Owners on user forums are split. Some felt better and more even power through the higher RPMs, while others doubt a measurable gain, so buy it for the throttle-feel upgrade rather than a guaranteed dyno number.
Fitment is listed for the 2003-2006 350Z, 2003-2007 Infiniti G35, and 2003-2005 Nissan Altima, all with the VQ35DE engine. Because the spacer uses the factory throttle body and manifold mounting points, it is a bolt-on job for a 350Z owner who already runs an aFe or other aftermarket intake. Confirm your intake setup with the manufacturer before ordering, since aFe's Silver Bullet line has previously required modifications for aftermarket intake systems. Search terms include VQ35DE throttle body spacer, 350Z 3.5L billet throttle spacer, and aFe 46-36008 install.
The manufacturer lists the 2003-2006 Nissan 350Z, the 2003-2007 Infiniti G35, and the 2003-2005 Nissan Altima, all with the VQ35DE 3.5L V6. Confirm your exact model year and intake setup with the manufacturer before ordering.
aFe publishes a claimed gain of +8 HP and +11 lb-ft of torque. Results reported on user forums vary, with some owners noticing better throttle response and others seeing little measurable difference. Details vary, so confirm with the manufacturer.
This is a moderate, driveway-level install. aFe's install sheets for other Silver Bullet spacers have you remove the engine cover and air inlet tube, disconnect the throttle body wiring harness, remove the throttle body bolts, then fit the spacer with the gasket and the longer supplied bolts. The spacer's "AIR IN" side should face the throttle body. Those sheets also warn against overtightening, so torque carefully. Owners on user forums have reported finishing the swap in about 10 minutes, though that will vary with your experience. Tools, torque values, and gasket details for the 46-36008 specifically were not confirmed, so check the manufacturer's install sheet before starting.
