?

 

The edge of the fenders where the paint stops has a sharp edge to them. When you slam your ride until the rims tuck under the fenders, the tires might rub againest these sharp edge. To fix this, you take a bat or broom handle. Roll along the fenders to fold and flatten out the sharp edge. This give you another 1/2" more clearance between the tire to the fender. No need to do this on the Maxima. You can't slam it low enough. Unless you plan on fitting 9" or wider rims.

 

I don't think it's ever necessary on the Maxima, tho.