....damn it i'll probrably sound like a right muppet but ive got a Bailey Piston type dump valve on my RS, not sure how old it is (at least 2 years old) but when you rev the engine at idle the piston seems to 'lift up' and open up the valve, if you know what i mean

also at idle it seems to open and close slightly, should it be doing that???? thought it only opened to let the boost pressure out

please humor me