If you’re looking for one of the easiest bolt-on upgrades for your 3rd gen 4Runner, the aFe Power Silver Bullet Throttle Body Spacer is a simple way to wake up throttle response and improve low to mid-range power where these trucks spend most of their time.
Designed specifically for the 1996-2002 Toyota 4Runner 3.4L V6, this throttle body spacer uses a serrated helix bore design that spins and accelerates incoming airflow before it enters the intake manifold. The result is improved air velocity, better fuel atomization, and stronger torque gains throughout the lower RPM range — especially noticeable when climbing mountain passes, crawling off-road, towing, or running larger tires.
One of the biggest complaints from lifted 3rd gen 4Runner owners running armor, rooftop tents, bigger tires, or overland gear is sluggish throttle response and loss of low-end power. This spacer helps bring some of that responsiveness back without major modifications or tuning.
Machined from billet 6061-T6 aluminum, the Silver Bullet spacer installs between the throttle body and intake manifold using included gaskets and hardware. No cutting, drilling, or permanent modifications are required, making it a clean weekend install for anyone building their 4Runner for trails, camping, overlanding, or daily driving.
Unlike cheap universal spacers, this system is vehicle specific and CARB legal, making it street legal in all 50 states.
Whether you’re building an old-school overland rig, refreshing your 5VZ-FE setup, or adding supporting mods alongside an intake and exhaust, this is one of those upgrades that helps your 3rd gen feel more alive behind the wheel.
Vehicle fitment verified for 1996-2002 Toyota 4Runner 3.4L V6 applications.
Features & Benefits
- Designed specifically for 1996-2002 Toyota 4Runner 3.4L V6
- Improves throttle response and low-end torque
- Serrated helix bore design improves airflow velocity
- Better fuel atomization for improved drivability
- Helps restore responsiveness on lifted or armored 4Runners
- Great supporting mod for cold air intakes and exhaust systems
- CNC machined billet 6061-T6 aluminum construction
- True bolt-on installation
- Includes gaskets and mounting hardware
- No drilling or cutting required
- CARB legal for all 50 states
- Made in the USA
Specifications
| Specification | Details |
|---|---|
| Part Number | 46-38001 |
| Brand | aFe Power |
| Product Type | Throttle Body Spacer |
| Material | 6061-T6 Billet Aluminum |
| Finish | Natural Raw Aluminum |
| Design | Block Style |
| Thickness | 1 Inch |
| Gaskets Included | Yes |
| Hardware Included | Yes |
| CARB EO Number | D-550-11 |
| Street Legal | Yes - 50 State Legal |
| Weight | Approx. 1.3 lbs |
Vehicle Fitment
Fits:
- 1996 Toyota 4Runner 3.4L V6
- 1997 Toyota 4Runner 3.4L V6
- 1998 Toyota 4Runner 3.4L V6
- 1999 Toyota 4Runner 3.4L V6
- 2000 Toyota 4Runner 3.4L V6
- 2001 Toyota 4Runner 3.4L V6
- 2002 Toyota 4Runner 3.4L V6
Compatible with aFe intake systems PN 51-11502 and 54-11502.
FAQ
Does a throttle body spacer actually make a difference on a 3rd gen 4Runner?
Most owners report improved throttle response and stronger low-end torque, especially on heavier lifted rigs running bigger tires or overland gear.
Is this good for overlanding or towing?
Yes. The added low and mid-range responsiveness is especially helpful during long climbs, towing, or technical off-road driving where torque matters most.
Does this require tuning?
No tuning is required. This is a true bolt-on upgrade.
Is this spacer CARB legal?
Yes. This throttle body spacer is street legal in all 50 states and includes CARB EO certification.
Can I install this at home?
Yes. Installation is straightforward using basic hand tools and usually takes under an hour.
