How do I verify my stock diverter valves aren't leaking. If I pressure check the system from where the MAF seats will the compressed air try to blow them open? I already found a leak at the F hose and I am assuming that the compressed air has gone through the diverter valves before reaching the F hose. Is that true? Thanks.

 

You need to pressure check from the turbos (or anywhere downstream from the DV dump behind the MAF), going from the MAF will give you pressure on both sides of the DVs which wont tell you much.

 

Am I right to think that I only need to pressure check from one turbo in order to get to both diverter valves, since they seem to sharing a common "manifold"?

 

Yes only check from one side but CAP the other.

 

Just replace the sh it with billet DV values and don't worry about it. I just spend $1k to replace the piece of sh it chrome outers on my wheels with high polished clear coats (chrome corrodes and leaks all the time). Many thanks to Berj at Grand Prix Tire and Wheel in Costa Mesa, a class act. You're driving a exotic supercar, don't skimp on minor upgrades.