The aFe Silver Bullet Throttle Body Spacer (part 46-37002) is a billet aluminum spacer that sits between the throttle body and the intake manifold on the 3.5L V6 in the Honda Accord. The manufacturer makes it from 6061-T6 aluminum and pairs it with a serrated/helix entry designed to swirl incoming air before it reaches the combustion chamber, which the manufacturer says also cuts down the intake whistle that helix-only spacers can produce. The manufacturer claims dyno-proven gains of up to 8 HP and 7 lb-ft of torque, with sharper throttle response. Results will vary with your setup, so treat those figures as the maker's numbers rather than a guarantee.
The manufacturer lists this spacer for the Honda Accord V6 3.5L and says it uses the factory mounting locations, so it bolts up without drilling or modifying the engine. It works with the stock intake or with aFe intakes TR-1007B/P and TR-1021B-R/P-D. Install is a manageable weekend job: remove the engine cover and air inlet tube, unplug the throttle body harness, take out the four throttle body bolts, and set the spacer and gasket in place with the longer hardware. Owners on user forums describe the job as quick, and the main pitfalls are wrench sizing and getting the four bolts seated evenly. Search terms this part fits include Accord V6 throttle body spacer, 3.5L V6 throttle response mod, and aFe Silver Bullet 46-37002 install.
The manufacturer's product page lists the Honda Accord V6-3.5L for 2008 through 2017. Other sellers and listing titles show narrower or different year ranges, so confirm your exact model year and engine by VIN with the manufacturer before ordering.
The manufacturer names the factory intake and two specific aFe intakes as compatible. For any other aftermarket intake, the manufacturer's documentation does not confirm fit, so check with the manufacturer first.
This is a bolt-on job for a home mechanic with basic metric sockets. Owners on user forums report that the four throttle body bolts are the main effort, and that the wrench size listed in some write-ups differs, so have both 12mm and 13mm sockets on hand. Aim for the opposite-corner tightening pattern so the spacer seats square. aFe's install sheets for its other Silver Bullet spacers say the engraved side faces the throttle body, and you should match that orientation to the markings on this unit. Reinstall the air inlet tube and clamps, then check all hoses before starting the engine.
