Well you will get something a little more than 20% increased braking torque at the front wheel so that claim is valid. The downside is that at lockup there is more reserve on the rear brakes, so it could be argued that it is a step back from 'optimum' retardation. It is a bit complicated to predict what effect they would have on peak retardation.
Fade resistance should increase with additional mass in the rotor (how much mass though)?
The increased unsprung mass will have a negative effect on road holding (whether or not it will be noticeable I couldn't comment on)
I don't see from the pictures how float between the rotor and the hat is achieved. Usually the fixing bolts are mounted in slots - but the pictures available don't obviously show this.
From memory I think that the DBA5000 series 2 piece rotors for WRX go for about AUD$300 per wheel as a comparison.
Do they supply new rotors only? At what cost?
They certainly look cool, but I still hold my reservations on the durability of cross drilled rotors. Despite what anyone says to the contrary!
Personally if I could get DBA rotors drilled to match your hubs at about 20% [edit... oops should be 30-40%, forgot about the other wheel!!] of the price I know what I would do. Besides what do current SP20 drivers replace worn rotors with? OE? Surely DBA would have a market if they provided an alternate drilling on DBA537? That said I am assuming that the dimensions of the rotors between 1.8 and 2.0L versions are unchanged - just the bolting pattern.
LOL
