So given that the car is driven in a "normal way" would performance parts such as pulley, port & polish SC, tune, exhuast effect the fuel economy? Positive or negative?

I guess what i really want to know is would adding all these things affect my fuel economy in a negative way, given that im driving in a controlled manor? thoughts.....

 

If driven in a conservative, fuel-efficient manner, your mods might have a minimal positive impact on your fuel economy. If you drop the hammer , any fuel economy gains are gone. But thats the price of increased speed and acceleration.

 

Changing the pulley on the eaton did increase fuel consumption on my car. Is understandable, it as the engine needs more to work more to drive the supercharger.

 

I am getting @ 19 avg via car computer daily driving 90% city driving like grandpa w/ intake, pulley, and cat back exhaust....but now that it is nicer that is going to change