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I use a readily available Parker-Hannifin pneumatic valve. It has a smaller **** than the Ruf, but still easy to dial. About $45.00 at most hydraulic supply houses.You can put a Ruf sticker on it ! Install is easily reversed to stock wastegate configuration.
Marty
Made this panel on a sheet metal brake, attaches with 2 existing fasteners. Installed the P-H valve and a vac-boost guage, some catchy German words and in business . Removable in 30 min=back to stock.