Noise reduction/air filter change for 625i

I have a new 625i Gator with the Kawasaki 2 cylinder engine. The vehicle is simply loud although the overall noise factor does not seem to be solely exhaust noise. On other threads I have noted a "noise reduction and air filtration" kit being available through Deere. My questions:

Is such a kit available for the 625i? if so what is the part number?
Is it effective? Previous threads reflect 825i experience and use of full cab.
Other noise reduction options NOT including the Silent Knight exhaust unit?

Thank you