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So I got it, and I installed it. Pictures are coming soon. However, I lost one of the bolts into the engine bay, and must order a new one. As of now, the sound is definitely bolder, but I don't know how to describe it until I can hear it during a slow rev from the outside. Stay tuned!
I'd have to take a look at an RX330 up close (I am in the US now), and see if you can attach some PVC or tubing on the front to the area behind he front driver's side area of the bumper for cooler air.