I purchased the slingmods one that goes behind the driver's seat. I know Snazzy's video says you can put it under the hood. I don't feel knowledgeable enough doing that, and when I brought it to the Polaris dealer they didn't know how to do that either and didn't want to. So I intend to just put it behind the seat as slingmods shows.
Peg, I used the Slingmod extensions as well but did not have to remove the battery as their video shows, since the only hard one to get to is the ground wire on the right side of the battery. That side has a ground wire that runs down in front of the battery and attaches to a screw on the frame which I used. Unscrew that ground wire first before doing the Red wire and don't let the end of the ground wire touch any metal part while you are doing the Red one. After you have finished with the Red hot wire, You will need to bend the end of the Slingmod ground to make it fit flush, but scratch the paint off around that screw hole for better grounding.
Before drilling holes, take note of how far back the seat goes and either put ur holes just below or just above. Also, separate the holes 3 or more inches, bearing in mind that alligator clips are often large and you don't want them touching should you need a jump start. Make sure the Slingmod ground wire is long enuf to reach the hole. I didn't have any prob; just something to remember while you're doing the fitting.
If anyone see any problem with the above, please chime in. More informed is always better.