Hmm.. i have wondered that too. Whether the adapter for the 2pot was the same as the brembo's.... or how close it was exactly. I didn't know the 2pot oem's will bolt to an r180 and line up with the smaller matching vented rotors (on the gravel setup), i thought they just used an R160 driveline, or a special backing plate that was different.
Hmm... i'm interested to test that out.
Can anybody confirm or deny that? I already have adapters for oem 2pots. I'd sure as heck be down if all i had to buy was special rotors and some brembo rears.