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I think a lot of it would depend on the stock weight/size of the UDP. if you go with a much lighter, but same diameter UPD, then I can see a definite gain. I think it also depends a lot on the engine itself.
a lightweight UPD in my Ranger would have shown about a 1% gain in FE as established by several people on the ranger forums Im a member of, and it was a planned MOD if I hadnt traded it off. but then again, my Ranger had the 3.0L engine, which is known in the ranger world as the 3.0slow engine. it had crappy torque, nil HP, but was arguably one of the better engine's Ford made in reliability.
so if your car seems to be slightly underpowered, then I think you would see some immediate benefits from this mod.
I also plan on an aftermarket UPD for my MP5 down the road.
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~Mike
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