I drilled out a set of stock mufflers I bought for 20.00 NEW. I have a header pipe left over, I am selling, the TOP muffler one, for the rear cylinder.
The FI system for the bike, is the same they use for their race bikes. It is a 32bit system, and adjusts your fuel mixture, that's the whole point of having FI over carburetor, but, there are limits. I drilled out pipes for my Vulcan I had, and I had to run it choked all the time...
Anyhow, richer is better for performance and safty, lean makes the chambers run hotter, I know. TO make it worse, PA gas is 10% Ethanol now, and we pay the same high prices as everyone else, and it's not pure gasoline. What a rip off that is, Ethanol kills gas mileage unless the motor is made to run on it.