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I have a 1997 MXZ 670 that is geared down on top to 24/44 with an 1-1/4 track. I also have it clutched. I am looking for some motor mods now. Thinking about getting the HO pipe and can or shortening the stock y pipe. What do you think about 501 RV and shorty boots? Also considering a thicker base gasket and shaving the head. How about porting? I am looking for more power, however I still want to run regular fuel and have it be debendable.

Thanks in advance
 
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