Originally Posted by vantasticc
Well its called a waste gate and thats what it does remove the waste air you just cant hear it on most turbo cars so people stick dump valves on which just make more noice...
Some people do indeed use dump valves just for the noise, but they're not the sort of people who would understand the real need for one or the thinking behind it
Anyone who's driven a turbo with half decent power before and after dump valve fitment will also know about the reduction in lag afterwards.
An essential purchase IMO for any driver of a blown motor