Originally posted by RCH:
Backpressure creates torque, but decreases power, so you could possibly free up your exhaust enough to make your car slower if not enough horsepower is created to compensate for loss in torque.
This is just the myth we are trying to dispell!
Loss of exhaust veloctiy causes torque loss. This happens when you pick an exhaust pipe diameter that is too large... Velocity and scavaging drop; therefore torque drops (Horsepower is a direct derivative of torque BTW)
Removing obstructions in your exhaust will not cause you to lose torque as long as the exhaust pipe diameter does not get too large. It only increases horsepower achievable (sometimes TQ increases as well depending on how bottled up the system was to begin with)
