there are many different exhaust-systems for the Ninja 250R.
Here's an example: (sorry international sale websites are useless if they are not have experience in sending goods to Thailand)
Another good website to look for is like all the time, I think you know the bay...
You can look in Indonesia (e.g. 'jiester-modified.com'), there is, I think the biggest market for Ninja-parts worldwide and they are not too expensive (but don't forget, when you buy over there you have to pay tax here in Thailand).
Before you buy one you should inform yourself what you're looking for: More noise then take a can from a shop here in Thailand, it's the cheapest way to get one.
If you're really looking for more power including better noise, then go for a full system like LeoVince.
The most loudest system should be the Jardine GP1.
And one more thing, get informed on Ninja 250-Websites like 'ninjette.org' (the best one) or 'newninja.com'. You can ask about everything and get the greatest help, esp. on 'ninjette.org'.
The Thai-Website for the Ninja 'ninja250thailand.com' is locked, you have to be registered to see anything, maybe there everything is secret or for members only?
I'd buy many parts all around the world now, USA, Indonesia, Germany, Japan and for sure what I could get here in Thailand.
I would like to spend my money here, because it's where I live now and I always wonder why there is no bigger market for the Ninja here?
By: ThaiDesign (offline) Monday, 26 March 2012 @ 12:01 AM ICT
One thing you should take in, is that in South-East Asia they have two versions of the Kawasaki Ninja 250R, one is the fuel-injected version as they sell in Thailand and the other one is a carburetor version they sell in some other countries...
Most manufacturers of carburetor versions of Ninja 250R exhaust pipes talk easy, just add a lambda sensor or oxygen sensor and the exhaust pipe will work fine... the truth is little bit different, the truth is that a exhaust pipe created for a carburetor bike will work to some extend on a fuel-injected motorcycle, when a position for the oxygen (lambda) sensor is created... but the get real performance benefits you should go for a exhaust system that was created for the fueling system your motorcycle has...
I use Yoshimura USA slip on in my Ninja 250. It cost me THB19.500, including service. There are options in this muffler, which is with silencer (to make the sound not to noisy) or without silencer (noise).