The HP #'s are all close on the top end between all the aftemarket air boxes, think the difference is 2hp (except the Ness, it's garbage for a few reasons) the torque is what wins it for the TT's but also come with a substantial extra cost. For instance I've seen the S&S selling for $260 ish and the Lloydz $320, the TT's are over $500. By no means is the S&S or Lloydz crap (neither is better than the other either) , no they are both damn good but the TT's are a bit better...
I certainly wouldnt call the Ness unit "garbage", it gave me a big increase in torque and reasonable HP, only real downside is removing and refitting for servicing, it flows great.
Care to state your "few reasons"?
Both S&S and LLOYDZ are more user friendly for servicing, what gets me is why have costly 'bling' under the tank? Surely they could make a serviceable item without the shiny stuff and save the punter at least a lazy $100.
For me the TT's are well worth it in easy servicing, they do look tough poking out , and sound great sucking in massive amounts of air. Torque is 'fatter' through the midrange, so is HP but it tails off up top....On the Dyno anyway, maybe in real world terms the fact there's 100mph of forced induction on the move maybe they don't tail off as much in the real world.
Would be interesting to see how Cams and Torquetubes compare up top, say 3000-6000 over stock or an airbox/filter.
I'm guessing they'd keep building Power and Torque all the way to the limiter