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Message: <blockquote data-quote="Jake Fluchel" data-source="post: 934289" data-attributes="member: 68838"><p>I personally experienced a ten percent increase in fuel economy when I removed the intake silencer from my WRX.  I usually set the cruise in the high 70's and very often had passing bursts of 90-120mph with the a/c on and still got 28mpg.  Before I removed the silencer I was getting 24/25mpg max on the highway.  The better an engine can breathe the more efficient it can be.  Thinking back, when I had the silencer on I drove the car as efficiently as I possibly could for one week(1 tank) and I got 26mpg.  I then determined that the resulting increase in mileage wasn't worth the lack of fun.  Since my ST isn't nearly as much fun(but I still love it), I drive in a more efficient manner.  my 2c.</p></blockquote><p></p>