Was going to run mine without d/v because i prefer the noise, but doesn't it decrease the reliability of the turbo?
Does a number of bad things -
* chatter noise is excess boost stalling the turbo blades so not good
* having no dump valve fatigues clamps and hoses much more so (not unheard of blowing off hoses w/o dump valve w/ hi boost)
* causes extra turbo lag between throttle snaps (eg gear shifts)
* trapped excess boost puts more stress on the seals and breather system
Ford is ONE of the CHEAPEST car companies in the World. They installed a BOV on a Cossie for a very good reason. Hence it stays IMO.
Running a Cossie at boost without a dump valve is like cigarette smoking to the turbo. It won't kill it immediately, but it will shorten it's life within time.