aFe 51-82502 Magnum FORCE Stage-2 Si is the enclosed intake for the specified Lexus GX470/Toyota 4Runner 4.7L V8. It uses one oil-free synthetic Pro DRY S filter, heat-resistant XLPE housing, black aluminum service cover and a rotomolded plastic intake tube. This merchant listing remains Race Only.
The current exact manufacturer page and shared illustrated manual identify 2005-2009 Lexus GX470 and Toyota 4Runner with the gasoline V8-4.7L engine. The named trims below retain their original year bounds and require that actual engine; they do not establish V6 compatibility or every regional intake/sensor revision. Confirm the MAF, throttle body, crankcase/vacuum routing, original mounts and engine-cover bracket clearance. The manufacturer explicitly says throttle-body spacer 46-38004 will NOT fit with this intake.
| Years | Make | Model | Named trim; actual engine and hood requirements apply |
|---|---|---|---|
| 2005-2009 | Lexus | GX470 | Base |
| 2005-2009 | Toyota | 4Runner | Limited |
| 2005-2009 | Toyota | 4Runner | Sport |
| 2005-2009 | Toyota | 4Runner | SR5 |
Verify 51-82502 against the actual engine, sensor and vent connections, mounting locations and applicable emissions requirements before ordering.
| Brand | aFe POWER |
| Manufacturer Part Number | 51-82502 |
| Application | 2005-2009 Lexus GX470 / Toyota 4Runner, gasoline V8-4.7L |
| Filter / medium | One Pro DRY S, three-layer oil-free synthetic, 6-inch height and 5-1/2-inch flange in current page |
| Filter revision qualification | Current 21-91021 versus scanned-manual/test 21-90044 |
| Housing / cover / tube | XLPE / black powder-coated aluminum / rotomolded plastic |
| Mounting changes | Original ground relocation and passenger cover bracket bent upward 1/2 inch per manual |
| Throttle-body spacer | 46-38004 will NOT fit with this intake |
| Bench-flow qualification | The current exact page advertises 190 CFM at 1.5 inches H2O and 66% more flow. The linked actual chart instead labels the tested system 54-82502, the oiled family option, at 190 CFM versus 124 stock: about 53.2% higher. The 66% headline and the chart ratio conflict, and the chart is not an independent selected-dry-media flow test. Do not substitute another pressure or invent a stock figure to reconcile them. |
| Dyno qualification | The linked actual chart tests a 2006 GX470 4.7L and identifies ProDryS 21-90044 in the intake-run notes. Its annotated power values are 206.23 versus 226.51 hp and torque 205.37 versus 225.57 lb-ft at separately marked high-rpm positions: about 20.28 hp and 20.20 lb-ft point differences. Run maxima are 208.89 versus 226.69 hp and 259.82 versus 268.50 lb-ft, or 17.80 hp and 8.68 lb-ft peak-to-peak. The advertised up-to-20 hp/20 lb-ft figures refer to point gains, not peak-to-peak gains. Both runs list OE exhaust, third gear, 10% brake before the run and Sport Mode, with SAE 1.02. The baseline also specifies Height Control Off and its RPM pickup location; the intake notes do not repeat every baseline condition. Temperature/humidity differ, and hood/fan/tire details are not stated. The current replacement-filter code differs from the legacy tested part; no independent current-revision, 4Runner or every-vehicle guarantee is established. |
| Market / use restriction | This merchant listing remains marked Race Only. The current exact manufacturer page says the product is not currently CARB exempt and is unavailable for purchase in California or use on a vehicle registered with the California DMV. The exact manual also prohibits California-registered on-road and off-road use. No blanket road-use approval or emissions-equipment removal permission is established. |
| UPC | 802959513453 |
| WARNING | This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov. |
| Quantity | Manufacturer service part | Component |
|---|---|---|
| 1 | 21-91021 current / 21-90044 legacy manual | One Pro DRY S filter; exact code/revision discrepancy qualified |
| 1 | 05-00823 | Housing |
| 1 | 05-00953 | Intake tube |
| 1 | 05C00823B | Black powder-coated aluminum cover |
| 1 | 05-00611 | Filter adapter |
| 1 | 05-01280 | 3.5-inch x 2-inch coupling |
| 1 | 05-01460 | 4-inch x 2-inch coupling |
| 2 | 03-50006 | #064 clamps |
| 2 | 03-50009 | #056 clamps |
| 1 | 03-50023 | #012 clamp |
| 1 | 03-50198 | Vent-hose T fitting |
| 9 | 03-50113 | M6 screws |
| 2 | 03-50030 | M4 screws |
| 2 | 03-50089 | Sensor spacers |
| 1 | 05-00631 | MAF gasket |
| 1 | 03-50063 | Isolation mount |
| 1 | 03-50087 | M8 nut |
| 3 | 03-50058 | Wavy washers |
| 1 | 03-50065 | Flat washer |
| 1 | 03-50191 | Brass hose fitting |
| 1 | 05-00122 as printed | 5/8-inch hose, 12-inch length; duplicate service-code qualification |
| 1 | 05-00122 as printed | 5/8-inch hose, 18-inch length; duplicate service-code qualification |
| 1 | 05-00069 as printed | 5/32-inch hose, 30-inch length; source-code qualification |
| 1 | 05-00937 | Auxiliary-inlet plug |
One selected dry filter is included, not the alternative oiled filter. The current exact page identifies replacement 21-91021, but the supplied scanned shared manual lists dry 21-90044 and its dyno notes test that older filter. Treat this as a service/revision qualification and confirm actual boxed dimensions before ordering a replacement. The hose table lists two 5/8-inch pieces, 12 and 18 inches, under the same 05-00122 code, and a 30-inch 5/32-inch piece under 05-00069. Those source labels are reproduced as written, not independently corrected into another kit service number. No new MAF or throttle-body spacer is bundled; spacer 46-38004 is expressly incompatible.
aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.
The current exact manufacturer page and shared illustrated manual identify 2005-2009 Lexus GX470 and Toyota 4Runner with the gasoline V8-4.7L engine. The named trims below retain their original year bounds and require that actual engine; they do not establish V6 compatibility or every regional intake/sensor revision. Confirm the MAF, throttle body, crankcase/vacuum routing, original mounts and engine-cover bracket clearance. The manufacturer explicitly says throttle-body spacer 46-38004 will NOT fit with this intake.
Which dry filter and revision are identified?The current exact page lists one 6-inch-high, 5-1/2-inch-flange Pro DRY S filter with three layers of oil-free synthetic media and service code 21-91021. The older scanned manual/dyno identify 21-90044 instead. Confirm the boxed flange and revision before replacement; do not oil dry media.
What material and cover does the housing use?The current exact manufacturer page identifies heat-resistant XLPE housing and a removable black powder-coated aluminum cover. The tube is described as heat-insulating rotomolded plastic; do not call the entire kit aluminum.
Does the MAF simply bolt directly to the tube?No. Transfer the original MAF with the supplied gasket and nylon spacers placed between sensor and tube, using the two M4 screws. A new sensor is not included.
Are bracket or ground-wire changes required?Yes. The exact illustrated procedure relocates the original ground wire and bends the passenger-side engine-cover support bracket upward 1/2 inch before reinstalling it. The housing uses two original bolts plus a supplied isolation mount. Do not describe this as requiring no changes.
Which hoses and covers are reused or replaced?One selected dry filter is included, not the alternative oiled filter. The current exact page identifies replacement 21-91021, but the supplied scanned shared manual lists dry 21-90044 and its dyno notes test that older filter. Treat this as a service/revision qualification and confirm actual boxed dimensions before ordering a replacement. The hose table lists two 5/8-inch pieces, 12 and 18 inches, under the same 05-00122 code, and a 30-inch 5/32-inch piece under 05-00069. Those source labels are reproduced as written, not independently corrected into another kit service number. No new MAF or throttle-body spacer is bundled; spacer 46-38004 is expressly incompatible. The engine cover reinstalls; the original intake cover panel is not reused.
How should the advertised flow and power figures be read?The current exact page advertises 190 CFM at 1.5 inches H2O and 66% more flow. The linked actual chart instead labels the tested system 54-82502, the oiled family option, at 190 CFM versus 124 stock: about 53.2% higher. The 66% headline and the chart ratio conflict, and the chart is not an independent selected-dry-media flow test. Do not substitute another pressure or invent a stock figure to reconcile them. The linked actual chart tests a 2006 GX470 4.7L and identifies ProDryS 21-90044 in the intake-run notes. Its annotated power values are 206.23 versus 226.51 hp and torque 205.37 versus 225.57 lb-ft at separately marked high-rpm positions: about 20.28 hp and 20.20 lb-ft point differences. Run maxima are 208.89 versus 226.69 hp and 259.82 versus 268.50 lb-ft, or 17.80 hp and 8.68 lb-ft peak-to-peak. The advertised up-to-20 hp/20 lb-ft figures refer to point gains, not peak-to-peak gains. Both runs list OE exhaust, third gear, 10% brake before the run and Sport Mode, with SAE 1.02. The baseline also specifies Height Control Off and its RPM pickup location; the intake notes do not repeat every baseline condition. Temperature/humidity differ, and hood/fan/tire details are not stated. The current replacement-filter code differs from the legacy tested part; no independent current-revision, 4Runner or every-vehicle guarantee is established.
What legal, torque and service limitations apply?This merchant listing remains marked Race Only. The current exact manufacturer page says the product is not currently CARB exempt and is unavailable for purchase in California or use on a vehicle registered with the California DMV. The exact manual also prohibits California-registered on-road and off-road use. No blanket road-use approval or emissions-equipment removal permission is established. The reviewed exact manual supplies no numeric torque or mileage-based recheck interval. Use exact boxed instructions and verify all connections; do not invent an interval from another kit.
Verify aFe 51-82502. With the engine cool, follow the manual battery-disconnection precaution. Remove the intake and engine covers, loosen both original tube clamps, disconnect crankcase/vacuum connections and MAF, and remove the tube and upper airbox. Remove the lower box and retain original mounting bolts, rubber grommets and spacers. Relocate the original ground wire from the side fender to the illustrated fender-wheel-well position. Assemble the supplied hose/T-fitting layout, including the larger vent hose and small securing clamp. Install the supplied isolation mount in the vacated factory mounting position. Transfer the two original grommet/spacer assemblies to the new housing, fit the filter adapter with M6 screws and loosely fit its coupling/clamps. Transfer MAF with the supplied gasket and nylon spacers BETWEEN sensor and tube, securing it with the two M4 screws; install the brass fitting. Remove the passenger-side engine-cover support bracket, carefully bend it upward 1/2 inch as shown in the exact manual, then reinstall it for tube clearance. Secure the housing using two original bolts plus the isolation mount with supplied M8 nut/washer. Fit the throttle-body coupling, install the selected filter at a slight angle and secure the aluminum cover using the supplied screws. Install and align the intake tube, connect the hose assembly and MAF, and tighten connections. Reinstall the engine cover; the original intake cover panel is NOT reused. No numeric torque or mileage-based recheck interval appears in the reviewed exact manual. Follow the exact illustrations rather than borrowing a different 4.7L intake procedure.
The current exact manufacturer page and shared illustrated manual identify 2005-2009 Lexus GX470 and Toyota 4Runner with the gasoline V8-4.7L engine. The named trims below retain their original year bounds and require that actual engine; they do not establish V6 compatibility or every regional intake/sensor revision. Confirm the MAF, throttle body, crankcase/vacuum routing, original mounts and engine-cover bracket clearance. The manufacturer explicitly says throttle-body spacer 46-38004 will NOT fit with this intake. This merchant listing remains marked Race Only. The current exact manufacturer page says the product is not currently CARB exempt and is unavailable for purchase in California or use on a vehicle registered with the California DMV. The exact manual also prohibits California-registered on-road and off-road use. No blanket road-use approval or emissions-equipment removal permission is established. The current exact page advertises 190 CFM at 1.5 inches H2O and 66% more flow. The linked actual chart instead labels the tested system 54-82502, the oiled family option, at 190 CFM versus 124 stock: about 53.2% higher. The 66% headline and the chart ratio conflict, and the chart is not an independent selected-dry-media flow test. Do not substitute another pressure or invent a stock figure to reconcile them. The linked actual chart tests a 2006 GX470 4.7L and identifies ProDryS 21-90044 in the intake-run notes. Its annotated power values are 206.23 versus 226.51 hp and torque 205.37 versus 225.57 lb-ft at separately marked high-rpm positions: about 20.28 hp and 20.20 lb-ft point differences. Run maxima are 208.89 versus 226.69 hp and 259.82 versus 268.50 lb-ft, or 17.80 hp and 8.68 lb-ft peak-to-peak. The advertised up-to-20 hp/20 lb-ft figures refer to point gains, not peak-to-peak gains. Both runs list OE exhaust, third gear, 10% brake before the run and Sport Mode, with SAE 1.02. The baseline also specifies Height Control Off and its RPM pickup location; the intake notes do not repeat every baseline condition. Temperature/humidity differ, and hood/fan/tire details are not stated. The current replacement-filter code differs from the legacy tested part; no independent current-revision, 4Runner or every-vehicle guarantee is established.
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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