I'm engine shopping. Here's how the Mazdatrix website describes their "ITA Special" engine:

"Includes- carbon apex seals, competition apex springs, side cutting of rotors for high RPM use, clearancing of all main and rotor bearings, special housing selection, hardened 3-window rear stationary gear, hardened front gear, rotor to rotor housing clearancing, balancing of rotating assembly, adjustable oil pressure relief valve, large oil pump..."

I know that many people have a far more "creative" interpretation of the ITCS than I do, but I don't see how side cutting the rotors or installing hardened gears is legal. Please help - I'd love to buy one of these if there's a legal rationale for the modifications.

Thanks!
Steven