I bought this pipe and silencer about a month ago, Motorsport had it on sale, fit and finish and very good,.bolted right up.. Installed on a '14 yz250, really woke this thing up, especially in the midrange & top plus it sounds Awesome!!
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Bill's pipe is the only way to go with a Zook 2 stroke! I tried 3 different pipes on the 125 and this is by far the best.
I bought a Bill's works pipe and silencer to replace my 4 year old Pro Circuit system, but the quality of the pipe I received wasn't that great. The pipe already had surface rust on it and one of the mounts didn't have the nut welded on it so I had to add a nut in order to install the pipe. If extra hardware is required for installation then it should be included. I sent a message to Bill's Pipes to ask them about it but never received a reply. It is still nasty in KY so I haven't had a chance to ride the bike yet, hopefully the performance will make up for the installation issues. If I had it to do over again I would have just bought another PC works pipe and R304 silencer.