How will straight pipes affect my horsepower, torque and gas mileage. I want an aggresive sound coming out of my dual exhaust and this is the best ive found so far. Yet at the same time Im not willing to give up torque and horses or pay a lot more for gas. Anyone with straight pipes or anyone who could send me info such as a sound clip on FLowmaster 40 series (Dual out) would be a great help. Thanks a lot