Go with the powerflow exhaust. Had a local guy here in PE (from powerflow) make me one from start to finnish. He did a good job and if those oaks do half as good a job you should still be happy. I also added a aftermarket airfilter and used a soldering iron to make some more holes in the air box. I then sent it in for a dyno. Boy what a difference.. I still have to come accross a 650 dual sport that will beat me from pull away to excelleration to top speed, alone or 2 up. Dont expect much increase on top end thou... You just get there a lot easier and hold it much better. Much better riding a 500c and leaving 650gs's or Klr's eating dust than riding a bigger bike and get eaten for breakfast by a 500cc.
ps. nothing was changed on the carbs except fine tuning it.
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