Hi... Where can I get a bike exhaust for a 125 cc bike in Bangkok? Are there any specific bike markets in bangkok? I am not looking at expensive brands but more like something locally made. 

Where in Bangkok are you?

 

I can't help with specific locations, we're rather out of town, but with the popularity of small bikes there have to be loads of places doing "performance" (more noise) pipes.

 

It's worth asking your local motorcy taxi chaps, they tend to know anything and everything in the area.

 

This is our local bike Aladdin's Cave, bet you have something similar nearby.

 

Drive around and when you see someone who has the same bike like you with an exhaust which you like ask him where he bought it.