Short Tors look 100% better and come with the added benifit of giving you access to the rear wheel nut.
Popping , a bit , worse than a 1600? Not sure really as it isnt really a loud pop as more and coughing of a bloke who smokes 100 woodbines a day.
Power , couldnt help as I had the shorties with the 1700 bb kit . Daz knows more about that as he tested a few.