Oh I dont know, my ets'?
It certainly isnt no slouch for a 496 It's running within a tenth of a couple 540's on alky leaving off the transbrake, if that is any indication?
But your right, I dont know, and I suppose I never will.
I dont normally throw $300 to $400 around just to "try" something different.
It took me over 4 years of saving and shopping around just to get what I got.
I made a informed purchase based on what I read and was told by fellow racers and> IMO it works very well.
Cp