Modification of motor bike in koh Samui is this within the law can I be fine or can the bike be taken off me

As long as you keep ALL thenumbers matching the original book, then you should have no problems, but TIT.

Mods are all ok except for the exhaust. This has been an issue in Bkk many times and right now no shop sell modified exhausts for small bikes. If driver gets caught and speaks where he bought it. Shop closed.

Also your engine number should be in accordance to your book still you dont drive around with your book.

If giving you a problem it should be about your bike being to noisy. Talk with the young guys on modified bikes. They are updated on wether the police will catch you or not.