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intake questions

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Hey Guys.

Has anyone used the Rusty's off road throttlebody spacer for the 89 4.0L ?

Does it make a signifficant difference and How about the Rusty's air intake with K&N filter was there noticable gains with either product or combined. the reason is I'm looking to increase my fuel mileage on a stock 89 eliminator.

Thanks for any help guys.

Marty :Canadaflag:

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