I would say your def. going to need a clutch kit w/ 30 inch tires or you will burn your clutch belt out regularly. Those big tires rob the machine of a lot of power w/stock setup. They have fixed cluth kits that are cheaper like epi or dalton. And they have adjustable kits you can change the weights around and achieve different clutch settings. The adjustable ones would be dirty dawg performance.
Leave it alone. The kit wont help much unless you are running a heavier tire such as a Silverback or outlaw. I ran mine w/o a kit with 29-5 laws for about a year and never burned a belt. The zillas are just about the lightest tire you can run. Just run in low gear if you are traveling under 10 and you will be fine. I finally added an EPI kit after I put a 6" lift on.