You need an intake plenum between the carburetor and air filter to reduce turbulence. We have found that 6" of intake is the best length for performance.
Anything you can do to improve flow through the engine is a plus. If you change where the engine is making peak power, the CVT may have to be adjusted again. What you will find is the CVT is tuned for fuel efficiency powering a scooter. The dynamics of a buggy concerning weight and terrain is so different than a scooter, that changing the CVT parts over for a closer buggy tune will always be desirable.
If you want excellent hill climbing and the ability to ride in soft sand, expect around 30 mph top speed. If you are willing to give up sand riding, you should be able to get a GY6 tuned to run 35-40 mph on hard pack.
Due to variations in heads, cams, intakes and exhausts, there is not one jetting combination that will work for everyone. You will most likely find a 32.5 pilot will give you good low end for your elevation. The higher RPM adds the flow of the of the main and pilot jets, so I always advise getting the pilot selected first. You should have 110, 112.5, 115 and 117.5 main jet on hand so you can do plug tests to find the best burn.
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