Quote:
Originally Posted by Low Impedance
on the other hand, auto manufacturers aren't looking at just power output.
Once you start porting engines, playing with tuning etc, the fuel economy, drive-ibility, reliability, etc change. Emissions comes into play. The switch from the 4 port 13b to the 6 port 13b was probably just a function of the above. Plus Mazda seems to enjoy experimenting with new ideas.
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Couldnt say it better myself. Performance vs. Stock, and the changes needed between the two are so different. Torque between 1000-3000rpms is SO important to mazda in a factory car. If my engine had to have full cats, air pump, etc it would have less torque in this area without a doubt.