Yes, I think the supertrapp pipe does almost add back what is lost when big tires are installed. Although I know it seems to add more of a punch on the 500 rather than the 400. The 500 automatic that is on my web page has one in fact he and I bought the first two pipes available to the public. His 500 has 26 inch Vamps on it and in two wheel drive it will literally spin the tires for several feet on dirt.

 

I purchased an AC 500 Auto after Christmas and have a little over 100 miles on it (hard to get around due to the snow here). It does seem like there is restriction in the oem spark arrestor. I see an increase in power on my machine with the clean-out plug removed at the bottom rear of the muffler. The noise level is just a little bit louder, but it makes a whistling sound. Does this aftermarket performance muffler have a spark arrestor in it? Should have one out here to ride in the national forest.

 

Yes, the Supertrapp IDS2 silencer is equipped with a spark arrestor.