if your atv is EFI< you have no jets to worry about, its computer controled for air and fuel mixing
and exhaust will add a LITTLE more power, and BY little I mean just that, maybe 1 hp actually to the rear wheels, when you do an exhaust a better breathing aior filter is a GOOD combo, want more air in to get more air out, BUT even a good filter and exhaust on PAPER might make 2-4 hp, and that doesn't mean 2-4 HP at the tires, and even if it was 2-4 hp isn't much really if you think about it, and it again for the $$< is your call on if its worth spending to get that little
the exhaust will make the atv sound different, better to some, LOUD to others!, again your call!
the programmer will be needed to get the efi system up to the big bore mod, or just reprogram the atv;s brain/computer, to run right
never done this to an atv, but have used programmers on cars and trucks, they work, but as for the car truck one's I have used, they ain't cheap either,. 300-400 for the one's I have had!, NO idea what they costs for an ATV?
NOW if your doing the big bore plan, and your NOT doing the work yourself, ist going to get pricy add the exhaust and them 2-4 hp(or say 10-12 with the big bore) is going to be a over a grand I am guessing
SO< is it really worth it to you??
all the more so if your only looking to run 25-36 inch tires??
Most folks get by in stock form on that size tires
sure we all would love more HP, LOL
But HP always comes at a price, and good reliable HP gains tend to never come cheap
why they say, better many times to just buy bigger at the start
I hear you on wnating a smaller sized atv, I like my smaller sized one better too for most things
just info to think about, not trying to talk you out of anything, just giving you idea's of what all is gained and costs!