You can easily fit 28 or 29s using the RacerTech lift.. I would recommend spacers of 1.5" per side, the lift claims 2" but can be between 1.5 to 3.3" depending on how you set up your shocks... The RacerTech lift is a far superior design to any others on the market and provide a gusset style plate incorporated into the lift I the ran and I personally have had 3 of the top lift kits and the front lift on the RacerTech is the strongest by far again.. You do drill 4 holes through the rear of the frame (3/8) easy, just easy, and there is one optional one up front in the center behind the radiator, you don't need to but again this kit strengthens the fram a lot for the extra abuse and strain put on the car from the lift... JMHO, if you want to see a detailed thread about the RacerTech and how it compares to the others just click the Forum link, then go down to projects and you'll see mine that's titled "say goodbye to my "old" RZR, cinstruction has begun" that's got sone great lift info...oh, and I'm running 27s...look at my garage and thread and see if you really want to go bigger.. You will need to reclutch as well and once you start going 27" and bigger even reclutched, without turbos big bores ect... You can say goodbye to running at 60+ MPH.. You might get 55mph if you dial in good on a stock engine.. Hope this helps
UPDATE: I didn't catch that you also had no LT KIT... I don't recommend exceeding 27" wheels and that's with the lift and 1.5" spacers.. I know, I ran that exact setup prior to my LT install!!