These titanium turbo beanies are of a small-medium size and designed to suit T3 and T3T4 sized turbos (will also fit TD05 and TD06 sizes and similar). These are the highest quality beanies we supply, and can withstand up to 1200 degrees. By insulating against heat loss, less cooling of the exhaust gasses occurs. This in turn means a freer flowing exhaust housing. The added bonus is engine bay temps are greatly reduced, as radiant heat in minimised.