So far I have made good power with every single pipe on the market. I have found that
they are all closely matched, but some do indeed take a little more to extract the power from, but in my opinion, the real tuning was with the bike...not due to the fact that it had brand "X" exhaust system on it. If I had to choose, my choice would be the Toobee Ti Force. Good power delivery and they seem to be a little less sensitive to having the exact map. For the very discerning rider, there are way too many other variables that influence the outcome of any exhaust system. This is not the case with all bikes, but by and large if a bike owner has difficulty with power being down with a pipe of brand name and built by a reputable company, then more cases than not it is the
state of tune on the bike and not the pipe.
Just my opinions...but based off of lots of experience. Hope this helps. Peace...Freddie