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Tom I bought the Yamaha gas 4 seater. I added the extended tail pipe, gas gauge on the gas tank, added an extra side view mirror and added an overhead shelf. Oh yea also added the dash with the 2 locking glove boxes. Other then toys there really isn't much else to add. After several months we decided to upgrade the tails lites to the LED model and also add the third brake light. We go out a lot after dark ( must be vampires ) and with the curtains down in cooler weather or rain you really couldn't see the rear lights on the 4 seat model.As for model type it's just like buying a car, each one has a little something different. For me it was gas and warranty. Good luck!