Using Porsche's online "Build Your Cayenne" I noticed that if I config a V6 with Manual Transmission and PASM that the Performance Sport Exhaust (PSE) selection does not appear. If I replace the manual transmission with 8 Speed Auto Transmission the PSE then appears. Does the PSE require the 8 speed Auto?! I know that you need PASM, which I did select with the manual transmission because the Sport selection is required for the exhaust but don't understand why you would need to 8 speed auto also for PSE. Is this an error with the online configurator?