I have an Explorer 2 with the factory coil. I do alright with it, but am looking for a reasonable upgrade that will produce noticeable results. I'm thinking of adding a 10 X 12 SEF coil to my bag of tricks. Would like some simple feedback about this coil. I looked at the posts about coils and this one seemed to have success. I have neck and shoulder problems, my Explorer 2 is on the heavy side for me now, how much more weight can I expect? Interested in comparisons to the factory coil too. Please, short to the point answers. Thank you. Jim