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Sparks exhaust is the best on the market.... the only pipe that makes near the horsepower is white brothers e-series.... if you don't beleive the gains you will when a raptor with a sparks system blows by you.....
For the money CT racing with a Dyno jett kit!You have to keep in mind that the four strokes are not like two stokes with a pipe change!Not nearly the power gain.Most of it is in the jetting! Skydog