Universal Cold Air Intake System — 4-Inch Diameter
AEM INDUCTION
MPN: AEM-21-5011
Price: $421.99 USD
Purchase details
In stock
Application requirements
Application notes
Application and compatibility
A fabrication kit for engine swaps and custom engine bays, requiring a designed intake route, suitable throttle/MAF connections and final fuel-trim checks.
Emissions
Status: Manufacturer usage restriction
The manufacturer instructions limit California use to racing vehicles that may never be used on a highway.
Description
AEM 21-5011 supplies 4-inch aluminum tubing, couplers and a Dryflow filter for fabricating an intake around an engine swap or custom engine bay.
| Tube diameter | 4 in |
| Tube bends | 45°, 90° and 120° |
| Straight tube length | 36 in |
| Tube finish | Raw aluminum |
| Filter | Oil-free Dryflow 21-2059DK |
| Couplers | Seven |
Key features
- Three bent sections plus a 36-inch straight section support custom routing
- Oil-free 21-2059DK filter
- Weld-on Hitachi blade-style MAF pad and couplers for a tubular MAF arrangement
Specifications
| Manufacturer part number | AEM-21-5011 |
|---|---|
| Tube diameter | 4 in |
| Tube bends | 45°, 90° and 120° |
| Straight tube length | 36 in |
| Filter | Oil-free Dryflow 21-2059DK |
| Couplers | Seven |
What's in the box
- Four aluminum tubes: 45°, 90°, 120° and 36-inch straight
- 21-2059DK air filter
- One 90° elbow coupler
- Four 4-inch straight couplers
- Two 4-to-3.75-inch adapters
- Two blank 12-inch brackets
- Hitachi MAF adapter pad
- Two rubber mounts
- 35-inch breather hose and aluminum nipple
- Six large clamps and two small hose clamps
- Four washers and four M8 nuts
Vehicle MAF sensor, additional application-specific adapters and fabrication/welding work are separate.
Install & Results
Install & Results
Manufacturer documents
Cut and trial-fit the tubing before final welding. Follow the manual’s filter clearance and straight-joint requirements. Position the MAF as directed and verify fuel trims before finalizing its mounting. Use the rubber isolation mounts and check clearance through engine movement.