Corsa Cacel Anti Surge Valve ??
 

Has anyone come across any problems with these tips. I'm looking at them and thinking that turbulent exhaust flow that can push against the counter weight and cause flapper to close. I talked with corsa about this any they claim it would not happen, but looking at the way they are set up and the way they move I can see it closing off the top side by having no weight on the bottom flapper and the exhaust pushing against the counter weight.