I wouldnt expect them to last very long if you are driving that much on the highway.
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429 Hp 832 Tq - 2007 6.7 2500 Bighorn Edition 4x4 6-spd Manual, Airdog 150, "HOT" Edge Juice w/ Attitude, TS MP-8, Airbags with Dual Control Air Compressor, H&S Delete & Downpipe, What EGR?, Valair Dual Disk, Amsoil Bmk-11 Bypass,
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