I used to run one on my car. Stock heads, full exhaust, 70MM TB, 77MM MAF, Typhoon intake were my mods at the time. Still had the 19# injectors and no FMU, but I had it tuned in person by SCT so no worries there. FWIW, it did run lean around 5500RPM with those small injectors.
Anyway, with the addition of a small 2.95" pulley on the blower I saw 295RWHP and 330TQ when on a Mustang Dyno. I can't recall the boost #s but that was the real-world power numbers and you know the Mustang Dynos tend to read lower than others. It was a great blower, and I loved it going through the stock heads. I had it on for a couple years and had zero problems. I think a grand for one nowadays, considering the alternative options you can come up with, is a bit much however.