Download the Pegesus software and there is a calculator included with it. All you need to do is punch in your tre size and wha-la!
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07 FX4 SCAB, 4.56 Yukons, K&N 57 CAI, Flowmaster 40 SI/DO, Rhino lined, Westin grille and tail light guards, Kobalt 2500 truck box and the best mod of all.....a Gryphon!
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