Forced Induction
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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

NEW Turbo kit for '91-'06 Jeep 4.0 Wranglers from 505 Performance
Garrett SuperT 60 Modified Turbo air cooled 6.5psi maximum boost
Fuel management system from Split Second
Complete Exhaust from header to converter
All Stainless or quality braided hoses
Stainless T-bolt Clamps
Oil pan-gasket one piece
Boost Gauge and hardware
All necessary air intake system including high flow K&N
Stock TJ: 148.8rwhp/191.3rwtq
Turbo TJ: 214.2rwhp/280.7rwtq
Hesco supercharger

No longer available.
Kenne-Bell supercharger

No longer available.
Avenger supercharger

No longer available.
Nitrous Express nitrous oxide kit

JEEP 4 & 6 CYL. EFI SYSTEM Part # 20920-10
(35-150hp)

SYSTEM CONTENTS

10lb. bottle with Pure-Flo valve
Lifetime guaranteed large solenoids
Hinged steel bottle brackets
14 foot stainless steel braided supply line
Heavy duty 40 amp anti-flyback relay
All necessary hardware

It's sold at Summit Racing under the part no. NEX-20920-10 and at Hesco. DYNOmite chassis dyno tests show a 65hp/100lbft gain at the rear wheels (~76hp/117lbft flywheel) of a 4.0 TJ when using the maximum recommended (for internally stock engines) 75hp kit.
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.

Kits include:

* Bottle and mounting brackets
* Control module
* Nitrous nozzles
* Wiring harness
* Solenoid
* Switch
* Hoses
* Rich/lean display
* Mounting hardware
* Installation manual