How can I increase Horsepower In my 98 jeep wrangler? Without doing anything

[TlROD]

too complex? What Can I do to increase horse power in my 98 jeep wrangler? I don't want to rip the engine out and install a V8 at the moment nor do i want to install a NOS or ZEX, but I do want to get the max power out of the inline 6 cylinder engine which I already have. Does anybody have any suggestions?

Here is a list of things I have already done to the vehicle
-Got a bigger exhaust system, headers and all (MAGNAFLOW brand)
-AEM cold air intake
-A 1 inch Throttle body spacer.
-Got a tornado over my intake (all this really did was make the engine run a little smother but no big difference)
-and I installed a hydrogen fuel system in it (this gave me an extra 3 miles to the gallon as well an extra 25 horsepower)

 

[william]

supercharge it

 

[getyourownbox42]

Holley throttle-body system, camshaft, maybe some head work. There isn't anything you can do to increase horsepower on an engine cheap unless its a v8 and we are talking bolt ons. For a reasonable price you can get a 4.2 and bore your 4.0 out, use the crank and rods from the 4.2 and make it a stroker. Torque monster..

 

[Jenna]

-Bore and stroke
-camshaft
-larger throttle body

good luck