I'm trying to understand if there are any mods you can make to the 1600 w/o changing the pipes. I like that the 1600 is somewhat quiet, but after riding it for a few months...it seems a lot slower than it did when I first got on it. I love the size and look actually more than the 2000, but would like more power. I do also like that I'm not spewing more polutants into the air than I have too. Please help.