quote:

Well the mopar comp. will give more horsepower. I have one, Im guessing they say that because it might start pinging on some hard situations while towing. Just go to a colder spark plug and that will take care of it. I tow quite a bit and no problems. Its deffintly better than if I didnt have it. The jet chips are junk too. They can screw up your pins.(thats what happend to mine) To burn up. There was a post where others have had problems with them. You can do a search for a full list of problems. For larger throttle bodys you can go to fastmans.com, or any of these for any parts. Ebay.com summitracing.com jegs.com Moparperformance.com
Some stuff will not be listed under the truck. Rams and durangos have the same engine. You can try for them. Or just do a search by engine size and make. For injectors they are all pretty much universal. Do some research and find out what flow rate stock is and go up one or two. You mentioned body injectors. Im not to sure what that is. A typo? You can get colder plugs. The platnums dont do go with our engines. Use autolights 3223 some thing like that the site below has it. You can get Msd coil and wires and cap and rotor. You can get a 180 degree thromostat. Performance pullys will help but lower your alt. power at idle as well as cooling. Becafull if you buy some. A lot out there are 6 ribs while stock is 7. There are a few small cheep stuff you can do. Like a kegging the intake, which is basicly opening up the intake on the inside. Do a search for more details. Here is a good site for tips http://www.v8performance.com/tipsandtricks.htm
One more thing you can do to get more power is change your rear end ratio. Go lower (numaricly Higher) gears. That will give you more torque, which is good if your going to tow.
Then there is the enigne stuff like cams, 1.7 rockers, flat top pistons, You can deck the heads and block, and bore out the engine.
The exhast. Get headers. Do a seach to find them. Get a better muffler larger pipes high flow cat.
Hope all this helps.
And be best of all a turbo system OR A SUPER CHARGER. Or do an engine swap. Bad96 did a 3.9 to 5.2 and he did a great post on it.
There are tranny stuff like shift kits.
Try to stay away from anthing that adds stuff. Stick to replacing and upgrading existing parts.