Muffler shield under the floor boards???

[Fred K-OR]

Have a question about these shields that you put over the muffler to shield the floor boards from getting hot. The question is: Do they do any good???

We took about a 75 mile trip in the huckster last weekend. Had some energy bars in a sack on the floor boards by my wife's feet. Well we ended up with melted energy when we tried to use the bars. So do these things help to keep the floor boards cooler or are they just a sales push by the vendors.