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How you can make your 4.0 breathe in more easily.
|Rusty's airtube and filter (left)
Rusty's Air Tube is one of the best things you can add to your vehicle. The air tube can be installed in about 10 minutes and will deliver 5 to 10 horsepower and will greatly improve fuel economy. Rusty's Air Tube is as simple as it gets but does the same job as the other guys that are priced 5 times as much. Rusty's offers two K&N filters to fit the Rusty's Air Tube which must be ordered separately. The 4.5" x 5" standard filters are plenty of filter for the 2.5 and the 4.0 liter engine. The 6" x 9" is recommended for the V8 engines and can be used on the 2.5 and 4.0 engines for a mean and muscle car look.
|Airaid Intake (right)
AIRAID Intake System; QuickFit System Type; w/o Intake Tube; Installs In 30 Minutes;
|Volant Performance Intake (left)
Jeep Cherokee 91-01
|K&N FIPK (right)
This Generation II Fuel Injection Performance Kit (FIPK) is now available for Jeep Cherokee 4.0 XJ's. Part # is 57-1519 for '91-'95 models, and 57-1518 for '96-'01 models. The filter flows 607cfm @ 1.5inHg and the FIPK produces a claimed 8hp gain.
A kit is also available for 1997-2001 Jeep Wrangler 4.0 TJ's. The part # is 57-1514-1.
|BBK 62mm throttle body (left)
All BBK 1991-2003 Jeep 4.0L throttle bodies are designed to increase airflow and improve horsepower from between 7-12 HP depending on vehicle and application.
BBK are the world’s number one manufacturer of aftermarket performance throttle bodies for late model EFI performance cars and trucks.
All BBK Performance Power+Plus Series throttle bodies are CNC machined from high quality 356 aluminum castings to ensure perfect OEM quality and fit every time. Features like OEM die stamped throttle linkages, double sealed bearings, o ringed throttle shafts, make BBK throttle bodies number one in performance and quality.
All throttle bodies are direct replacements and include new gaskets and detailed installation instructions.
|Fastman throttle body (right)
Bored to 62mm 2.440" bore
Custom Stainless Shaft
Feathered Edge Brass Blade
|F&B Flometrics billet throttle body (left)
Applications: 1991-2003 Jeep 4.0L straight 6 and stroked motors (4.2L - 5.0L)
F&B Jeep throttle bodies are available in 66mm and 68mm bore diameters (stock is 60mm necked to 56mm). Some intake manifold porting should be done to enlarge the manifold opening. These throttle bodies have a 3" inlet and are compatible with stock air intake systems (not recommended because of flow restriction) and most aftermarket air intake systems.
|Hesco '87-'90 Throttle Body Upgrade (right)
This kit is designed to up-grade the early three bolt throttle body to the 1991-up four hole, larger bore High Output (HO) unit. Kit consist of all brackets, bolts, adapter plate and standard HO throttle body.
|Hesco '05-'06 Hi-Flow 62mm Throttle Body (left)
62MM Hi-Flow throttle body for 2005-2006 4.0L Jeep engines. Ideal for stroked and modified engines for maximum power gains. A 62mm Throttle Body Spacer # HES62TBS can be added for addition power gains and a high flow air filter or filter kit can also be purchased for maximum performance. All 1991-95 4.0L applications should purchase our Adjustable Fuel Pressure Regulator # HES9195FR for optimum results as the factory PCM programming is lean.
Note: 1997-2004 will need to install your factory sensors on the new unit.