Winter is coming in a few months and my BFG's are worn out. I am thinking about a cheap way to get some tires with better traction than I have now. I am running two hi-tec mud terrain retreads (my spares) and my two best BFG's so I don't have to buy 4 new tires. Has anyone siped mud terrains for better grip in the wet and snow? Can you do this with a utility knife or do you need one of the electric siping knives? I am thinking of buying two more retreads, siping them, and running them through the winter. Would it be a good idea to sipe retreads? I know the mud terrains are a lot louder than most all terrains and I wonder if siping them cuts down on the noise at all.