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Naturally-aspirated horsepower not enough?
Force-feed your engine with either a supercharger, turbocharger or nitrous oxide kit. This is the single most effective method to achieve a large torque increase from your engine without increasing the engine displacement. This is real bolt-on power without needing to modify the engine internally. For the ultimate horsepower/torque increase, you can even add any of these power adders to your stroker engine.
505 Performance Jeep 4.0 YJ/TJ Turbo Kit
|Sprintex Supercharger System
The Sprintex Supercharger System for Wrangler TJ is an easy, completely bolt-on, self-contained oiling system installation with no need for external oil lines. 42% more horsepower; 152 HP stock to 216 HP supercharged and 34% more torque; 193 ft/lb stock to 259 ft/lb supercharged. Engineered and tested to OEM specifications. Uses stock air filter housing. Completely reversible. High-quality materials and finishes. S5-210 ultra-efficient twin screw compressor for more power at lower RPM. Performance & Reliability may vary on vehicle condition and modifications, etc.
Cherokee 4.0 Liter 6 Cylinder Side-Mount Supercharger
No hood modification necessary!
* altitude dependent. unit comes with standard pulley, higher boost pulleys can be purchased under accessories.
Wrangler TJ Supercharger 2005-2006 Wrangler TJ 4.0 Kit from RIPP Superchargers. This kit now features a state of the art and innovative Water To Air Intercooler, with built in water tank, By Pass Valve flange and air intake temp grommet. This unit will easily cool the 8psi peak in any environment. The GEN2 now features 6 larger primary injectors, plug and play map sensor and Pre-Programmed Diablo Sport Intune for re-flashing of the ECU.
Banks Power Performance Turbo Kit
Breathe new life into your Jeep with the all-new Banks Sidewinder Jeep Turbo System. This complete bolt-on system is engineered for ultimate performance and rock crushing capability. The Banks Sidewinder Turbo System transforms your 1999.5 through 2006 Jeep Wrangler into a pavement eating, rock crushing, trail running monster.
» Horsepower Peak-to-peak:
Venom VCN-1000 nitrous oxide system
Jeep, Cherokee, Wrangler, Grand Cherokee, 4.0L kit Part # N48-137
VENOM VCN-1000 computer controlled nitrous oxide kits practically run themselves. All you have to do is set the nitrous flow by choosing one of the four nitrous nozzles supplied with the kit (25, 50, 75, or 100 additional horsepower). The kits are designed to cut off nitrous flow automatically if the air/fuel mixture becomes too lean. Plus, they adjust fuel flow through the injectors, so you don't have to modify the vehicle's fuel pressure. VENOM VCN-1000 computer controlled nitrous oxide kits are ideal for return-less fuel systems.
Nitrous Express nitrous oxide kit
JEEP 4 & 6 CYL. EFI SYSTEM Part # 20920-10