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Ford's 4.6L and 5.4L Modular V8S are workhorses — but the factory intake on 1997-2003 F-150 and Expedition was designed for quiet operation and parts-bin cost savings, not airflow. The stock system draws air through a restrictive paper-panel filter inside a sealed plastic box, then routes it through a narrow, ribbed intake tube choked with resonance chambers. The engine does the work — it just does it with one hand tied behind its back.
This Flashark cold air intake replaces the entire factory setup with a large-diameter aluminum intake tube and a high-flow dry cone filter enclosed in a heat shield. The smooth mandrel-bent tubing eliminates turbulence and restriction in the stock ribbed plastic path, while the open-element filter draws cooler, denser air from inside the shielded engine-bay pocket. On an otherwise stock 4.6L or 5.4L, expect 5-10 wheel horsepower and a noticeably sharper throttle tip-in — especially in the 2,000-4,000 RPM range where these trucks spend most of their working life.
Installation is a direct bolt-on affair. The heat shield mounts to factory bolt locations, the intake tube aligns with the stock throttle body using the included silicone coupler, and the filter clamps onto the tube inside the shield. No cutting, no drilling, no permanent modifications. Basic hand tools, under an hour, and your Modular V8 breathes as it should.
Key Features
Large-Diameter Mandrel-Bent Aluminum Intake Tube — Single-piece construction with integrated MAF sensor flange. Finished in heat-resistant matte black powder coat. Delivers a smooth, unrestricted airflow path that eliminates the turbulence and restrictions of the factory-ribbed plastic tube and its multiple resonance chambers.
Heat-Shielded Dry Cone Filter — High-flow red cotton-gauze element enclosed in a formed steel heat shield. The shield blocks direct engine heat while drawing cooler air from the fender-well pocket. Dry-type media requires no oiling — clean, rinse, dry, and reinstall for the life of the vehicle.
Direct-Fit Silicone Coupler — Bridges the intake tube to the throttle body with a precise, airtight connection. Heat-resistant silicone won't crack, deform, or collapse under engine bay temperatures or vacuum.
Complete Hardware Kit — All mounting brackets, clamps, breather hose connectors, and fasteners included. Everything shown in the product images is in the box — no extra parts to source.
True Bolt-On Installation — Mounts to factory bolt locations using the included bracket and hardware. The stock airbox can be reinstalled at any time. No cutting, drilling, or permanent modification required. Basic hand tools, 45-60 minutes.
5-10 WHP on Stock Tune — Realistic gain on an otherwise stock 4.6L or 5.4L 2V Modular V8. The most noticeable improvement is sharper throttle response and stronger mid-range pull between 2,000-4,000 RPM, not a peak dyno number.
Deep V8 Induction Sound — The open-element filter and aluminum tube produce a throaty, aggressive intake growl at half-throttle and above. Audible in the cab under load without being obnoxious at cruise. Complements an aftermarket cat-back exhaust perfectly.
No Tune Required — Factory ECU's MAF-based fuel trim system adapts to the increased airflow within its correction range. Bolt it on, start it up, and drive.
Specifications
SKU: FLIS25006
Intake Tube Material: Aluminum
Intake Tube Finish: Matte black powder-coated
Filter Type: Dry
Filter Media: Red cotton-gauze
Heat Shield: Formed steel, black finish
Estimated Install Time: 45-60 minutes
Package Includes
2 × Matte black powder-coated aluminum intake tube
1 × High-flow red dry cone air filter
1 × Formed steel heat shield
2 × Silicone throttle body coupler
1 × Complete hardware kit
1 × Installation guide
| Years | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 1997-2003 | Ford | F-150 | 4.6L V8 / 5.4L V8 | All cab/bed configurations |
| 1997-2003 | Ford | Expedition | 4.6L V8 / 5.4L V8 | All trims |
| 1997-1999 | Ford | F-250 LD | 4.6L V8 / 5.4L V8 | Light-duty only (7-lug, same platform as F-150) |
| 1998-2003 | Lincoln | Navigator | 5.4L V8 | Confirmed by vehicle title; verify intake layout before purchase |
Q: Will this fit my 2001 Ford F-150 with the 5.4L V8?
A: Yes. All 1997-2003 F-150 models with the 4.6L or 5.4L 2V V8 are direct bolt-on — regardless of cab configuration (Regular, SuperCab, SuperCrew) or bed length. The intake routing is identical across all F-150 variants of this generation.
Q: Does this fit the 4.2L V6 F-150?
A: No. The 4.2L Essex V6 uses a completely different intake path, throttle body position, MAF housing, and mounting layout. This kit is engineered for the 4.6L and 5.4L Modular V8 engines only. Installing it on a V6 would require extensive modification and is not supported.
Q: Does this fit the F-250?
A: It fits the 1997-1999 F-250 light-duty model only. This "F-250 LD" was essentially an F-150 with heavier springs and 7-lug wheels — it shares the same engine bay and intake layout as the 10th-gen F-150. It does not fit the 1999+ F-250 Super Duty, which uses a different platform with distinct engine bay packaging.
Q: Will this fit a Lincoln Navigator?
A: The product title includes 1998-2003 Lincoln Navigator with the 5.4L V8. The Navigator shares the Expedition's platform (UN173 chassis), so the intake routing is substantially similar. However, the Navigator's engine bay has additional differences in sound-deadening and accessory layout. We recommend verifying that the MAF sensor housing type and throttle body orientation match the kit before purchase. Contact service@flasharkracing.com with your VIN for confirmation.
Q: Does this work with both 4.6L and 5.4L engines?
A: Yes. The intake tube, coupler, heat shield, and filter are designed to work with both the 4.6L 2V and 5.4L 2V Modular V8 engines as used in 1997-2003 F-150 and Expedition. The throttle body diameter and MAF housing are the same between the two displacements in these model years, so the same kit fits both.
Q: How much horsepower will I gain?
A: Expect 5-10 wheel horsepower on a stock 4.6L or 5.4L 2V engine. The most noticeable improvement is not a peak dyno number — it's the sharper throttle tip-in and stronger mid-range pull between 2,000-4,000 RPM, which is exactly where these trucks spend most of their time during daily driving, towing, and merging. Gains are more pronounced when paired with a cat-back exhaust.
Q: Will this improve throttle response?
A: Yes — this is the most immediate difference you'll feel. By removing the restrictive factory airbox, ribbed intake tube, and multiple resonance chambers, the engine can draw air more easily. The result is quicker tip-in response from idle and less hesitation when accelerating from a roll. It won't fix existing issues like dirty injectors, worn spark plugs, or vacuum leaks, but on a healthy engine, the difference is noticeable.
Q: Will the intake make my truck louder?
A: Yes — the open-element cone filter and aluminum tube produce a deeper, throatier induction sound compared to the sealed factory airbox. The difference is most noticeable at half-throttle and above, especially under load (merging, passing, towing). At idle and light cruise, it remains relatively quiet. The sound complements an aftermarket cat-back exhaust without being overbearing in the cab.
Q: Do I need a tune after installing this intake?
A: No. The factory ECU's MAF-based fuel trim system automatically adapts to the increased airflow within its correction range. Install it, start the engine, and the ECU will adjust short-term and long-term fuel trims during normal driving. A custom tune can extract additional gains if you've also done exhaust, headers, or throttle body upgrades — but it is not required for safe operation.
Q: Will this trigger a check engine light?
A: Not when installed correctly. The most common causes of a CEL after intake installation are: MAF sensor installed backward or with a damaged O-ring, a loose electrical connector, a disconnected or kinked breather hose, or a coupler/clamp that allows unmetered air past the MAF. Double-check all connections, especially the MAF sensor orientation and the silicone coupler seal, before starting the engine.
Q: Is the filter dry or oiled?
A: Dry filter — no oil required. The red cotton-gauze media filters without oil saturation, which eliminates the risk of MAF sensor contamination from excess filter oil. Modular V8 MAF sensors are sensitive to oil residue, and a dry filter avoids this entirely. To clean: tap off any loose debris, wash with filter cleaner, rinse thoroughly, and air-dry completely before reinstalling.
Q: Does the heat shield actually help?
A: Yes — the formed steel heat shield serves two purposes. First, it physically separates the filter from the hottest part of the engine bay (the exhaust manifold side). Second, it creates a semi-enclosed intake pocket that draws cooler air from the fender-well area. While not as thermally efficient as a true "cold air" system that routes into the fender, it provides meaningful heat isolation compared to an unshielded cone filter sitting directly in the engine bay.
Q: Will I get better fuel economy?
A: Not guaranteed. Reduced intake restriction can marginally improve cruising efficiency under steady-state highway driving, but the effect is small and easily offset by driving habits. If you're driving harder to enjoy the new induction sound, you'll likely see no improvement — or even a decrease. Fuel economy on these trucks is dominated by vehicle weight, aerodynamic drag, tire choice, and driving style, not intake restriction.
Q: How do I transfer the MAF sensor?
A: Remove the MAF sensor from the factory airbox lid — typically held by two Torx or hex screws. Do not touch the sensing element (the thin wire or film inside the housing). Transfer it to the new intake tube's MAF flange in the correct airflow direction (arrow on the MAF housing points toward the throttle body). Ensure the O-ring or gasket is intact and seated, tighten the screws evenly, and firmly reconnect the electrical plug until it clicks.
Q: What should I check after installation?
A: Before starting: verify the filter is clamped securely inside the heat shield, the intake tube is fully seated in the silicone coupler at both ends, all clamps are tightened evenly, the MAF sensor connector is clicked in, breather hoses are connected and not kinked, and the heat shield is not rubbing against the fan shroud, belt, radiator hoses, or wiring harness. After starting, listen for hissing (vacuum leak), check for a steady idle, and scan for codes. Re-torque clamps after the first heat cycle.
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