black widow mufflers

I forgot to add that I have the 10" Widowmaker mufflers. This is from their website:

With virtually no restrictive qualities, the Widowmaker 10" produces Black Widow’s signature aggressive and clean tone with a small 10” x 5” footprint. Ideal for tight spaces, the Widowmaker has a straight through patent pending internal hourglass design that allows for maximum horsepower and torque – and without a harsh drone sound.