I went with a Turbosmart VeePort Instead. I like their products - high quality and super easy to adjust. Turn the valve all the way to soft initially, let the engine warm up, rev the car a few times, turned it 1 turn for a harder close, went for a drive, backed it off 1/4 turn. Done. No springs or shims to swap combinations. Oh yea, and it isn't obnoxiously loud - just a faint woosh.
Hopefully LMS can trick the computer into thinking the stockers are still thereso I don't have to leave them hooked up to prevent a CEL. If not, I already made an extension harness to put them in the fender well. Just need to depin the factory connector relocate it to the extension and put the new connector on. Then if I ever go back to stock just take the extension off and swap connectors.
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