It's probably peak 15-20 hp. However the stock tune for the TOR/cat bypass limits peak torque at around 2700 rpm by about 12 ft lb just by closing the secondaries in gears 1-3. You can regain this power by using Tuneboy to open the secondaries 100% in all gears. You can also have Triumph install the tune for the stock exhaust and then install a PCIII and have it custom dyno tuned. As noted, putting individual filters on the throttle bodies can also get you more power.