i had the same as you chris with a 4.5 nosram and a 12.5 rotor in my xx4. belt loss's made it mint to drive n bloomin scary down the straight as it just kept on revving all the way once it had stopped spinning up
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Nathan Ralls HPI, Custom Blitz,
www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline