I purchased a non efi cart from Carts and Clubs in December. They told me that for an additional $600 I could purchase an efi cart. After some consideration I decided to just go with the regular gas cart because I didn't think that the advantages were worth the $600. Just my opinion. The other day I did ride in an efi cart while golfing with a friend. It was a little bit quieter than mine but he had a foam pad under the seat which I'm sure reduced the noise somewhat. I contacted Carts and Clubs about this and was told that I had purchased a deluxe seat which didn't come with the foam pad because if I had one it would be touching the motor.
I am happy with my cart for quite a few reasons, meei cabin, rear shelf, and nice seat. I think I'll just stick with what I got.
John