I'm not 100% sure on this either, but based on the info that i have had in the past, i suspect that Chris may be correct.
However, if i was a manufacture, i would release all of my motors with sintered rotors as well. So if i were LRP i think i would offer a 6.5 with sintered and bonded, and 5.5 with both etc. GM have done this i believe. They have the Evo 2 range that are generally bonded, and the Evo 3 that are sintered.
They will have different power bands. For example, at the first big European Touring car event of the year (using 2007 rules, so sintered legal) - Ronald Volker won with an LRP 4.5 fitted with bonded rotor - despite sintered having theoretically more power. The rest of the LRP runners in the final ran sintered!!!
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