Not quite sure what's changed or is it the same motor tuned up.

Think the redline was raised. Pretty sure the old motor didn't go over 9000rpm. And the old one was tuned more for extra torque down under as the output is only like 500-510hp. 

Maybe lighter stronger valve-train, lighter pistons? I wouldn't be surprised if they are using 3D printed pistons like on the GT2RS. 

 


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