I have a European WR426 2001 make. In order to UNLEASH the potential power it has I have decided to change the original pipe (muffler) which is extremely silent (restricts and cannot be modified). I posted an advertisement and now have two offers that I am considering (1) a used orginal YZ400 muffler or (2) a used White Bros E-series pipe (make 99 I guess). The prices are equal. Can somebody tell me which pipe suits best?