I want carbon fibre products made in vietnam, can anyone suggest where i would find producers?

japan! japan is the number one source.

If your already experiencing troubles with them again then they were not properly installed or the Cylinder head is warped. Head gaskets should give years of trouble free service as long as they are installed correctly and properly torqued. Unfortunately any additive will be for short term repair although they do advertise one that is suppose to work for longer. Bars leak has never worked well though so do a little research and you may be able to find the better stuff if thats the route your going to go.

you might try to google it, but, i have alot of carbon fibre on my car and iv never heard of a company in vietnam that produces it, mine all came from japan or america. a really good company is fibre images.... you might try them for your carbon fibre needs.