Exhaust Valve f430

One of the exhaust valves on my f430 has died. It wont stay shut even when vacuum is applied. There are a ton of valves available to buy from lots of suppliers. I was planing on having a new one put in since the only other option is to buy a whole tailpipe assembly for $500 (used) to $1300 (new). The operating pressure of the aftermarket valve is between 2-5.5 psi. Does anyone know how much the factory vacuum canister pulls and if this valve will work? Thanks!