Speed Wolf is now a Dyno Port dealer. Dyno Port makes custom made quality pipes for many applications right here in the USA. We have installed a Dyno Port pipe on one of the Speed Wolf r&d bikes and noticed a big difference throughout the RPM range. The top end was extremely noticeable. The first thing we did was richening up the top end on the Lectron power valve adjuster. From personal experience I can say these pipes are a very high quality and worth the investment. We stock a few pipes and the site will keep an accurate inventory with the option to backorder. Also some pipes we will not be stocking can be ordered and drop shipped directly from Dyno Port. ***NOTE*** average wait time for pipes NOT IN STOCK is 4-6 weeks as they have to me made to order.