Quote Originally Posted by larry_arizona View Post
I have read nothing on different heads. But yes, heads are considered hard parts.

I doubt it has different heads, porting etc usually raises the operating rpm range which would sacrifice low end torque.

The bigger throttle body and hi tq intake manifold and tuning makes sense.

I think you are also correct, if they tuned for higher octane fuel that is where max power would be, but with knock sensors, you can get away with 89 at a loss in power.


Sent from my iPhone using Tapatalk
Good to know. I appreciate the info!