When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Nope just soot in all four pipes,i ride with mine 100% in track an i have not cleaned the center ones even once,makes you wonder.
It isn't just the carbon but also the moisture. The outside pipes are lower so they are where the moisture is exiting. Soot in the water is left behind.