This muffler cover is constructed out of stainless steel and hand TIG welded. It also has a spark arrester built in.
Expect cooler running temperatures, a rowdy sound, and 6-10% horsepower gain.
BARK BOX MUFFLER COVER 500I
I've already been impressed by the 500i but the bark box is a definite upgrade. I don't notice it having any more power, I think the horse power gains are marginal but the snappiness in the throttle is noticable and the saw runs way cooler than with the stock muffler cover. Pros: Very well made Easy install Increased throttle response Cooler temperature saw Throaty sound Cons: Horsepower gains questionable Loud af Increased fuel consumption