If i have am old style set of mach 7's what would it cost to exchange/update them? Also how do i identify them by number... long story short bought the truck with "mach 7's" based on what ive read i trust that they are they seem to have a stainless body, fuel hard, make good power, but i get better mileage than i did with my 150hp jammers... any help is appreciated.
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