I have read post on Harley forums were it was said guys got smoother throttle performance through the power range from low to mid with the closed end cap over the open end cap on the 2-1 systems even though the torqe curve stayed some what the same. The end caps were set up to flow the same between the open end cap and the closed in cap then they did dyno runs with each set up to check performance.

I have heard this said before about the two diffrent end caps set up to flow the same. Some say the cloased end cap responds to the throttle better due to the way it breaks up the exaust gas at the exit of the muffler over the open end cap.

Is there any founded truth to these statements???? Again I have heard this said several times by Harley riders with Supertrap 2-1 systems over the years.

Bill G