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An intercooler will benefit greatly as FSJs arent light. Then when you add fuel and boost, your cooling potential is greater which translates to more power.

I would also add a 3k governor spring kit. Then turn up fuel a bit (with a pyro installed of course). Then you can do injectors or turbo tweaking.

I think just adding an intercooler and 3k GSK will suprise you though!
 

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I took a 380 mile trip yeaterday for work and took the truck. I got 21.4 MPG

Getting a 4b to 200 will require some mods, parts, and $$$. I can run through traffic no problems, haul cars, etc and I know Im not 200 HP. Im probably around 150.

I used a dodge bellhousing which bolts to post 95 GM nv4500s. then it bolts to the dodge motor plate.
 
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