Yep, those $1700 slip-ons made the rounds a year and a half or so ago. There was a big push to "pre-order" them but no stats on them were forthcoming. Despite repeated requests the promoter could not produce any dyno sheets. They sound good but apparently are not in the same class as D&Ds, Jars or the legendary PREDATORS.
I heard a similar thing. They look absolutely brilliant but by utilising the stock headers and being such a short design they cannot possibly produce the same power as the aforementioned full systems.
Plus its a hell of a lot of $$$ for a slip on :shock: