What do those things mean for AC models (400-500ish)

Also, what yeah was the best year for water riding (where they had it snorkeled), the 2004? Changed in 2005?

 

I as in 500i stands for independent which was used 02-03,meaning the 500 had independent
rear suspension which wasnt the only choice then.They had solid axles too then unlike now.LE means limited
edition which consists of chrome/polished aluminum rims,accessory bumpers//brushguards,warn winch,and sometimes a color only available in LE,auto tranny. Regular has basic options like ugly grey rims,red or green plastic,no accessory bumpers,or winch,manual tranny,or auto for more,ect.

 

They did change the snorkel on the 2005's and put it inder the rack, instead of under the seat. This isn't as good, however you can add a snorkle to one for next to nothing.