hi i have a 4.6L v8 2004 ford expedition with a k&n filter and i swapped the muffler out to a magnaflow, also put a 3 inch slant cut tip. i would like to kno what would give me some more noticable power for cheap. my budget is around $500 so please any advice would be greatly appreciated. i will respond to u by "adding details". also if you know of any sites that sell performance parts for expeditons please post the link.
Most any 4.6 parts for a Mustang will fit your truck. I don't know for sure, but probably swapping heads & intake to the PI parts from a same year police car should give you like 25 or 30 hp. Don't know if you can get it done for $ 500, tho, unless you're good with a wrench & can do the work yourself. Check e-bay for the parts. If that's too much, & I think it would be a fair amount of labor to do the head swap, then look for the elbow & throttle body from a Mustang.
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