These titanium turbo beanies are of a small size and designed to suit factory Subaru turbos such as VF22-VF42 (will also fit similar sized turbos). 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.