i think with 14 it looks a little strange with tires under 28 inches and I would be worried about flat spotting the rims by bottoming out the tires on rocks. So I would go with 12 inchers. Also 14 inch tires and rims are more money.
The HMF Swamp series exhaust and a unifilter with a carb mod and rejet will get you some more good low and mid range power. The exhaust is pretty quiet(don't get the xl version) A tire upgrade will help out alot, I have maxxis zillas 27" now but was running mudlites 26". I would recommend the 26" mudlites for you. They are good on the trail and good in the mud. Those are the two lightest aggressive tires and won't rob much power. Any other questions just ask.
