I was very happy not to have to replace the exhaust just to get it to run, and I actually think the stock cans look as good as the termi's.
Even though the Termi slip-ons are a rip off, the bike runs much better with them and the included up map. And I think they look better than stock too, just not $1800 better.
Oh well, its all aluminum but I have no trouble cleaning it with Klasse all in one polish