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Well, I finally installed the Blackwing today after having it sit for about a year in the garage. The install was real simple and I wonder why I didn't do it sooner!
On my first drive, I immediately noticed he meatier exhaust sound - it almost like getting a new exhaust by just changing the filter!
My impressions are that it doesn't do that much on the low end of the RPM scale, but the car now continues to pull hard as the RPMs increase. Prior to the Blackwing install it seemed to stop pulling before the A4 shifted gears.