Hi BlasterJax, cool ! I feel zero difference in initial throttle response and throughout the entire powerband, so from your scale, I give it a 3. I did a launch control run from 0-60 and noticed no change either (4.77s vs. a best run of 4.65s when I first got the car).
Is it a rip-off? Yes it is for the cost and no noticeable difference performance-wise, but the value comes from the cool sounds it makes and how it enhances the look of the engine bay. I leased the car, so I don't want to alter the ECU too much, so no, no tune. But it's a neat enough bolt-on mod to do if you have the disposable income.
It is louder than what you perceive from videos, and when you are accelerating, the sucking noises begin from 1,500rpm onward, and I love letting off the throttle to hear the blow-off valves relieve themselves, haha. And no, I did not get a tune. If you get a tune, you may notice more power if you clock yourself.
