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Dr.D is one of the best out. Doug Dubach has done extensive work with Yamaha R&D. Allot of people swear by Dr.D in my neck of the woods. I’ve seen many and never herd a bad word. They use the step system or theory. Cool thing is the step rings are welded in different spots for different bikes….so it not one size fits all type pipe but is tuned different for individual makes and models. I will probably pick up a Dr.D head pipe to go with my TBR silencer
 
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