Yea there are some free stuff that wakes the sled up. I know when I did mine the compression went up an so did the power. I did find out if you have a worn engine ( rings) the rings will go out soon so check ( replace) your rings so you don't find out the hard way.
My old 98 600 ran pretty good, boyessen reeds, air box mods, can, jetted down 1 size from stock. I liked how it ran, nothing like my srx, but ran well. that sled was a lot lighter also & the fuel milage sucked.