AEM

V3 water/methanol injection kits. Complete systems with a pump, controller, injector, lines, and fittings, offered with or without a reservoir.

V3 HD kits. Higher-flow kits for larger engines and higher power levels, including a version without a reservoir.

V3 naturally aspirated kits. Kits set up for engines without a turbo or supercharger, with or without a reservoir.

Controllers. Standard, multi-input, and HD controller kits that decide when the system sprays and how much.

Injectors and hose kits. Standard and HD injector kits, plus hose kits for servicing or extending a system.

Which AEM kit is right for my engine?

Boosted engines typically use the standard V3 kit, which ramps fluid delivery with boost.

Higher power or larger engines typically need an HD kit for more flow.

Naturally aspirated engines use the NA kit, since they don't make boost to reference.

Reservoir or no reservoir. Choose a kit without a reservoir if you plan to use an existing tank or a custom location.

For a broader explanation of how water/methanol injection works and how to size it, see our water meth kits category page.

The controller is the brain of the system. A standard controller suits most boosted street setups. A multi-input controller can use additional engine signals for more precise control. An HD controller pairs with HD kits and higher flow. If you're upgrading an existing AEM system, match the controller to your kit and injector size.

Installation notes

• Mount the reservoir and pump low and away from heat, and route lines away from moving parts.
• Place the injector after the intercooler and before the throttle body, following AEM's instructions.
• Set up the controller for your engine's boost or load range before driving hard.
• Use the recommended fluid mix, and keep the reservoir filled if your tune relies on water/methanol.
• Check for leaks and spray pattern before the first hard drive.

Common problems AEM parts address

Knock at higher boost on tuned gas engines, which water/methanol commonly helps control.

High intake temperatures during repeated pulls.

A clogged or worn injector or controller on an existing AEM system.