AIRAID AIR-400-591 AIRAID Throttle Body Spacer for Ford and Lincoln
Part # 400-591
Features
- Constructed from 6061-T6 aircraft-grade aluminum with precision CNC machining, this spacer is engineered to deliver long-term durability and precise airflow control, even in demanding driving conditions.
- Designed to improve low-end torque, the spacer sharpens throttle response and provides a more immediate, energetic power delivery the moment you tap the pedal.
- Enhances mid-range horsepower for stronger acceleration during daily driving, towing, or passing on the highway, giving your engine a smoother and more consistent power curve.
- Includes precision-cut gaskets, high-quality hardware, and application-specific brackets to ensure a perfect fit and reliable seal.
- True bolt-on upgrade that installs in under an hour with common hand tools. No drilling, cutting, or modifications required, making it one of the easiest performance add-ons you can install.
Description
The AIRAID Throttle Body Spacer is engineered to increase off-idle torque from roughly 800 rpm up to 3,000 rpm. Its patented Helix Bore design creates a spinning airflow as it moves through the spacer, boosting air velocity and improving atomization of the air/fuel mixture before it enters the combustion chamber. The result is enhanced part-throttle torque and stronger mid-range power.
Specifications
| CARB EO Number | D-609 |
|---|---|
| Finish | Black |
| Gaskets Included | Yes |
| Material Used | Aluminum |
| Mounting Hardware Included | Yes |
| Package Material | Plastic Other |
| Package Type | Blisterpack |
| Product Style | AIRAID PowerAid |
| Spacer Type | 4-Barrel Open |
| Street Legal In All US States | Not legal for sale or use in California on any pollution controlled motor vehicle. NOTE: Some specific models and years may be legal in CA. Check the CARB status on your parts at knfilters.com. |
| Thickness | 1 in (25 mm) |
| TUV Approved (Europe) | No |
| Weight | 1.1 lb (0.5 kg) |
| UPC / GTIN | 00642046405915 |
| Warranty | 12 Months - 24,000 Miles warranty |
| Year | Make | Model | Submodel | Engine | Note |
|---|---|---|---|---|---|
| 1997 - 2004 | Ford | Expedition | - | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 1997 - 1998 | Ford | F-150 | - | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 1999 | Ford | F-150 | Base, Lariat, XL, XLT | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 2000 | Ford | F-150 | Base, Harley-Davidson Edition, Lariat, XL, XLT | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 2001 | Ford | F-150 | Harley-Davidson Edition, King Ranch, Lariat, XL, XLT | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 2002 - 2003 | Ford | F-150 | King Ranch, Lariat, XL, XLT | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 2004 | Ford | F-150 Heritage | XL, XLT | 5.4L V8 | California Air Resources Board Exempt: Yes; CARB EO: D-609; Airaid Throttle Body Spacer |
| 1998 - 1999 | Lincoln | Navigator | - | 5.4L V8 | California Air Resources Board Exempt: No; Airaid Throttle Body Spacer |