You can do the pair valve mod to get rid of the backfire. PC really won't help with that.Thanks Josh this just what I needed, I notice since I installed the Yosh RS-3 race cans I have more back fire so maybe it will not hurt to add a PCIIIR, again thanks for the info.
Ya....you will need a PAIR mod to get rid of the backfiring.From what I understand smallbox mod takes from the low and gives to the high end or vice versa. Doesn't really add power, like changing teeth on sprockets.
Just so we are talking about the same thing.....Thanks Bro's, so just to let all this info sink in, I will do the pair block off and see if that will take care of the back fire before I jump in to jetting it out, I will post some pic and you guys know how did it all go.