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Silver Bullet spacer for exact engine and intake requirements
The aFe 46-37001 Silver Bullet spacer fits the specified Honda/Acura 2.4L four-cylinder applications. The March 2026 manual distinguishes its torque and intake-tube modification from the V6 spacer kits.
Key Features
- 6061-T6 billet-aluminum serrated/helix entry design; claimed turbulence and reduced whistle do not guarantee an improvement on every setup.
- 6061-T6 billet aluminum with serrated/helix entry.
- For Takeda TM-1018P, the exact manual requires cutting 3/4 inch from the throttle-body end of its intake tube. The current page calls this TM-1018P-X; confirm the actual tube/version before any cut.
- Manufacturer power, response and whistle statements are claims, not guaranteed results.
Fitment
| Years / source scope | Model | Exact requirements |
|---|---|---|
| 2012β2015 | Honda Civic Si | 2.4L; not other Civic engines |
| 2008β2012 | Honda Accord | 2.4L four-cylinder |
| 2013β2015 | Acura ILX | 2.4L only; not 2.0L or hybrid |
| 2009β2014 | Acura TSX | 2.4L only; not V6 |
46-37001: The current exact page and March 12, 2026 manual agree on Accord 2008β2012. Legacy Accord 2013β2017 rows conflict with that narrower current scope, despite retailer claims and broader older EO coverage; they are withheld as source-conflict holds, not declared physically incompatible. Named Accord/ILX/TSX trim rows still require the exact 2.4L engine. No 2.0L, V6 or hybrid application is inferred.
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 46-37001 |
| Material / design | 6061-T6 billet aluminum; serrated/helix entry |
| Engine / application | See exact engine-specific fitment table and source qualifications |
| Sealing arrangement | Install the supplied gasket and spacer between manifold and throttle body as shown, with AIR IN toward the throttle body. |
| Throttle-body fastening | The March 2026 exact manual specifies 22 Nm (16 ft-lb) for the four supplied M8 screws. Do not substitute the V6 kit's 15 ft-lb. |
| Emissions scope | The page cites D-550-17 / D-550-47 but lists 3.5L engine-test groups on this 2.4L product page. That apparent cross-listed disclaimer is not a verified exclusion table for this part. D-550-47 could not be read; exact exemption and test-group coverage remain unconfirmed. Verify the actual EO and underhood label rather than assuming blanket legality. |
What's Included
- One Silver Bullet spacer and one gasket
- Four M8 x 90mm screws
- Four M8 flat washers and four M8 lock washers
About aFe Power
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
Related Parts
- Browse aFe Power by exact engine and installed intake; shared brand membership does not establish compatibility.
- Use the exact spacer, seal and fastener list; do not substitute another spacer from a broad model title.
Frequently Asked Questions
What is the 46-37001?A model- and engine-specific Silver Bullet throttle-body spacer, not a complete intake or replacement throttle body.
Does it include a filter or coupling?The exact parts list below governs. Generic manufacturer page fields do not establish a supplied intake filter or coupling for this spacer.
Are gains guaranteed?No. Turbulence, throttle-response and whistle statements are manufacturer design claims, not guaranteed horsepower, fuel-economy or sound results for the actual engine.
Which sealing parts are used?Install the supplied gasket and spacer between manifold and throttle body as shown, with AIR IN toward the throttle body.
What is the correct torque?The March 2026 exact manual specifies 22 Nm (16 ft-lb) for the four supplied M8 screws. Do not substitute the V6 kit's 15 ft-lb.
Are all original search rows certified?The current exact page and March 12, 2026 manual agree on Accord 2008β2012. Legacy Accord 2013β2017 rows conflict with that narrower current scope, despite retailer claims and broader older EO coverage; they are withheld as source-conflict holds, not declared physically incompatible. Named Accord/ILX/TSX trim rows still require the exact 2.4L engine. No 2.0L, V6 or hybrid application is inferred.
Can another spacerβs instructions be substituted?No. Gaskets, O-rings, brackets, screw sizes, control cables and intake restrictions differ by exact part number.
Does the EO reference cover every application?The page cites D-550-17 / D-550-47 but lists 3.5L engine-test groups on this 2.4L product page. That apparent cross-listed disclaimer is not a verified exclusion table for this part. D-550-47 could not be read; exact exemption and test-group coverage remain unconfirmed. Verify the actual EO and underhood label rather than assuming blanket legality.
Installation Instructions
- Read the exact manufacturer instructions for 46-37001, verify the actual engine, intake, hardware and applicable emissions scope before removal.
- Verify the exact engine, intake and current manual. Remove the original intake tube and disconnect its vent line.
- Remove the four throttle-body M8 screws and the M8 bracket screw.
- Position the spacer and supplied gasket as shown with AIR IN toward the throttle body.
- Install the four supplied M8 x 90mm screws with lock and flat washers. Tighten them to 22 Nm (16 ft-lb); restore the bracket with its original bolt.
- For an applicable TM-1018P tube only, confirm the version and follow the manual's 3/4-inch throttle-body-end cut. Do not transfer this cutting instruction to unrelated intakes.
- Restore the tube, vent hose and clamps. Recheck bolts and clamps after 100 miles; verify exact EO labeling and exclusion scope.
46-37001: installation details and any unresolved source scope must be matched to the actual vehicle before use.
California Proposition 65 Warning
California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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