These tests were conducted a few years ago on a customers LT 500 that had the below set up and a Trinity pipe and silencer,  The information below is what I know to be accurate.  The customer said the ports and head were stock.  I did not remove the top end to varify that it was a stock cylinder and head.  The power valve was operational and optimized for each pipe the best it could be due to the power valves inconsistant operation from run to run.  The jetting was optimized for the trinity pipe but not for the Q or HPR pipe.  The jetting was closed enough for the Q and HPR pipe and would not significantly affect the relative power curve shape from one pipe to the next.

The test were conducted at 1100 ft elevation on the same day within a few hours of each other.  Intake temperature was 73 to 77 deg. F with humidity in the 37 to 40 % range.  Correction factors were in the 3% to 4% range.

HPR TM 41 Mikuni,  540 Main jet,  27.5 Pilot jet,  R6 389 Needle Jet,  6DK3-3 Jet Needle,  4.0 Cut away,  Duncan Paramid reed cage,   RU 3480 K&N Mounted to stock LT 500 air box hose,    Power valve is operational,   

Blue      HPR 9 pipe and silencer

Red      Q1.0 stamped pipe and silencer

Green  Trinity pipe and silencer

Wow! At no point does the Trinity pipe even begin to compare to the others.

Which style of Trinity pipe was tested?  Old style in the mid 90's my buddy had a Trinity pipe on his LT500 that was the traditional FMF, DG, Bills style of pipe routing.  The Trinity pipe that is available today is the side pipe inframe style similar to Aaeen, Q, ect.