I got some info on my Borla S Kit over the stock exhaust. Had a few minutes on my hands and made a chart. (It's what happens when my wife wants to watch road show antiques lol)
The Blue line is the new Borla S "Touring" and the Grey line is stock.
Yes you don't get more peak power Here I seemed to access more under the curve power at the ramp up. Torque starts bouncing off the peak at about 2800 vs 3050 for stock with stock muffler peaking at 3300 matching the sport muffler is there at 2900.
Also Someone might have been looking for the OEM suitcase muffler and I have one to let go if you want to talk PM me. cheap + shipping. 6 months old.
Its torque vs RPM on the horizontal.
