I bought this knowing an ECU upgrade and more boost is in the near future. The install was foolishly quick...under 5 minutes with a flat screwdriver. The black valve looks great without drawing attention. The sound is admittedly cool, and I'm making a couple more pounds of boost (didn't expect that). All the ricers in town stalk me trying to find out what's up with the very stock-looking 9-3 making all the cool noises. The valve has become louder after a week or so of break-in.

Rating: [5 of 5 Stars!]