termingoni 
  I got a set of these of e-bay for my ST2.  Can I fit them to the bike without a performance chip ?  i.e. I know they will lean out the fueling so is there enough adjustment in the trim pot to compensate ?
 I do intend to get a FIM chip later but would like to fit the pipes now.
 Also where is the best place to get a 14 tooth front sprocket from for the same bike ?
 
 Thanks