Exhaust
From Ninja250Wiki
A Note On Exhaust
Muzzy is the only company currently making full exhaust systems for the Ninja 250.
Two Brothers Racing has recently started making slip-on cans for the Ninja 250, as has Yoshimura. SuperTrapp/Kerker makes universal-fit cans; see the article below.
If you just need to replace your stock cans, you can usually find some decent used ones on eBay.
Muzzy Exhaust
Yoshimura Slip-ons
Two Brothers Racing Slip-ons
Custom, Tunable Supertrapp Slip-ons
Unobtainium
The following systems are no longer manufactured, but may be available used.
Miscellaneous
I want to repaint my exhaust pipes.
====Cleaning your exhaust pipes:==== WD-40 works well for general cleaning. If you have scuff marks from your boots, E-Z Off oven cleaner will remove them (from chrome cans, at least). Another product that works on chrome is Mothers Wheel Polish. See also this review of Blue Job Chrome Polish.