Of the top of my head, I'm gonna say 16. Someone will probably correct me with the exact capacity. I believe there is a gallon or more than sits out of reach of the strainer, to prevent sucking water, dirt, etc.lyonsd said:How many gallons does the fuel tank hold?
Anytime you improve air flow, be it intake or exhaust, you will see an increase in HP and fuel economy. When I had full exhuast put on my '87 Toro and built a K&N cold air intake for it, my mileage increased from an AVERAGE of 18mpg to 20mpg and that's mainly short trips. I can only imagine how much better the cruising efficiency of the WRX will become!Penguinking said:...you kidding me? are the cats in the car hurting fuel economy that much?