The aFe Silver Bullet Throttle Body Spacer (MPN 46-32004) is a billet aluminum spacer that mounts between the throttle body and intake manifold on the Dodge Ram 1500 V8-4.7L. aFe machines it from 6061-T6 aluminum and gives the entry a serrated/helix pattern. The manufacturer says this pattern stirs up airflow just before it enters the engine and reduces the whistle common to helix-only spacers. aFe lists it for 2002 through 2007 Ram 1500 trucks with the 4.7L V8.
Compared with the stock setup, the spacer lengthens the air path between the throttle plate and the cylinders, which aFe says sharpens throttle response and air speed into the engine. aFe does not publish a horsepower figure for this part, so expect improved throttle feel and airflow rather than a specific power gain. Owners searching for a 4.7L Ram throttle body spacer usually want that throttle response without the whistle of cheaper helix-only units, and this design is aimed squarely at that concern. Machined billet aluminum also gives a more precise fit than a basic plastic or cast spacer.
The manufacturer lists this spacer for the Dodge Ram 1500 V8-4.7L from 2002 through 2007. Check your truck's year and engine against the manufacturer's fitment guide before ordering.
The manufacturer states that the serrated/helix entry is designed to reduce the whistle heard with helix-only spacers. Owners on user forums report that some whistling can still occur at light throttle, so results vary.
This is a bolt-on job for a home mechanic with basic hand tools. aFe's install sheets for other Silver Bullet Ram spacers call for 8mm and 10mm sockets or nut drivers, disconnecting the intake air temperature sensor, removing the intake tube, and removing the four throttle body bolts. Leave the factory sealing O-ring in place and keep the stock hardware in case you return to stock. The 5.7L Ram sheet specifies 49 in-lb and warns against overtightening, which can damage the intake manifold, so confirm the torque for your 4.7L before tightening. The same sheet notes that the engine cover may need trimming because the throttle body sits higher, and it advises rechecking all bolts and clamps after 100 miles.
