I just put money down for a 2007 Honda 919 w/ 3500 miles on it. I'm soooo excited!

Anyway, there are two mods that I will want to do pretty quickly after I get it:
1) Install sliders (crash protection, or whatever you call it):
I've read some reviews around the web, and I see all kinds of opinions about which brand or type to get. I'm pretty sure I don't want the Sato because I saw a photo of an engine damaged by their crash sliders. So far, the ones that "look" the best to me, but I haven't seen them in real life, only on photos, are the GSG frame sliders.
Does anybody out there has had (unfortunately) experience in that field? Did they work? Which kind?
2) Aftermarket exhaust:
Beautiful bike, great engine but... is sounds like a vacuum cleaner

And, if I can gain a little bit of power that'd be icing on the cake.
Some are very expensive, but have very good reputation, others are much less expensive, but are they any good? Are there mods you can apply to the stock exhaust? (exhaust surgery)
Also, if I modify/exchange the exhaust, will I have to modify the engine settings or is that not necessary?
Thanks!
Guy