I have an 89 lx 5.0. I have a BBK cold air intake, accel ignition, plug wires ect. I have a set of shortie headers x pipe off road no cats 40 series flow masters with 2.5 inch pipe. The timing is bumped up. If I get a E303 cam will there be much of a difference in horsepower. Also I want the car to have a rough idle sound. Will this cam make much of a difference compared to the stock cam? Since I have the no cat exhaust will you be able to hear the cam more than the stock cam. How much of a difference?