Well, I finally got the mileage results from my aftermarket installations (Turbo muffler, Tornado Performance Booster and K&N drop in replacement air filter). I got 20.5 mpg on my last tank of gas which is a 13% increase over the 17.8 mpg my Tundra was averaging before the installs.
I installed all three within a week of each other, so I don't know which one contributed the most. The prices are as follows: muffler, $62 installed; tornado $78, air filter $52 ($192 total). Since I drive about 11,000 miles per year, I will save nearly $120 per year on gas (given a $1.45/gallon average).
Even without a cost savings, the added HP is FUNNNNN!!!!!! I just love it when a Civic/Eclipse pulls along side and goes for the pass
