Okay, so whats the best exhaust for the 2007 model? Slip-on or full exhaust? What about jetting for us flat landers in nebraska? And finally air box mods, what should be done?

 

There is no best model. Pick one that looks good to you and your wallet. Full systems make more peak power than a slip on. Of all the systems only Big Gun and Muzzy have had dyno charts posted and there was a very minimal difference. Jetting would be based on system and elevation. Just remove the snorkel from the airbox, or remove the lid entirely but I couldn't get it jetted right across the whole rev range with the lid off.

 

I use the KDX200 snorkle. It shoves right in and works great. It's probably twice the opening of stock and you still have the lid on for some deep water protection.

 

I was told for a 250 a slip on is ok. If however you want to go 300 or 331 then the full system is a must. I have ordered a staintune slipon myself and was told if I upgraded down the track (300cc big bore)I could buy the header and install itwith out any problems. Some pipes wont be so easy to install without some modificationsthough, so find out from the supplier first if there will be any dramas later on down the track.
Cheers!