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For what it's worth, install is possible without draining the coolant/removing the water pump (non-x) - I did it last weekend. You need to remove the inlet pipe and that will allow you to access the top two bolts. Remove the splash shield and fan and then unbolt the water pump but do not drain or remove - this will allow removal of the bottom bolt. Go in with a long extension from the front of the car. It's a pain but it's very doable.
Great little mod - my stock valve was leaking boost and I didn't even realize it until after the mod. Installed with the spring - no CELs. Change in sound was minimal for me (stock airbox). Hope this helps!
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