Last night on my 99 i took out the factory resonator on the exhaust right under neath the bell housing and i moved my intake to the passenger side and my truck definitely feels like i have more power my 91 had more then my 99 did and last night and romping on it i can feel a power difference again i love it i can break the tires loose on the high way when its wet out going around 30 MPH 32 inch tires on stock 3.55 gears i could never do that before removing the resonator and moving the intake to the passenger side