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I didn't answer when you posted this in the hope that someone with first hand experience would reply, but FWIW, I know someone who did use the WR system and they weren't impressed, especially for the price. I don't think they felt there was any benefit.
In another FWIW, I just did the air box delete on mine and noticed no change with that. I didn't expect any power change, but thought maybe I'd see a change in MPG. If it did anything, I haven't noticed. I'm still glad I did it though even on the off chance the engine can breathe any easier.
