the crazy serp belt is all about lower resistance, the whole motor is about lower resistance. some cool things though, no more pulling wrist pins to get pistons it comes apart like a normal V motor piston and rod. also the alt, compressor and pwr str pump all come off as a unit. it also has permanent tumble generators. subaru is also going to be very aware of service history if the motor has a problem. first time a motor has be sent to the US before Japan or Europe.
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