just put a unifilter in the stock box, I personally have not seen any real gains with a airbox/ filter adapter on the 700. That will cost you around 34 dollars vers 100-300. Get some no-toil oil and cleaner works great on the filters. What cdi(edu) are you using? If you do go with a exhaust you will need to change your fuel map. You can go with a tip, or make one if you can fab, and it would be around one hp gain. You can do that without changing your map. I have heard alot of good about the muzzy dual and have seen the results. Someone are fans of the dmcs also. I have not heard much on the the woods on the 700, but did hear its not as good as the 660 woods. That should give something to think about, if you have any questions let me know.