Thx for the advice. I went with a pair of 650s piggybacked off the pair of 1100s. Had to remove the under seat separator piece but they fit perfectly. I am filling those 4 bags and nothing up front the as the GSA tabs prefer weight in the rear . Making a great wave with tons of push! Just need to sort out the Vision screen issues of random things popping up and bags filling and draining which I believe was caused by the way the GSA was wired.