I installed it myself...one hour tops...took the factory exhaust in one piece -- easy. I must say that due to the price and the lack of performance sound from the Corsa exhaust (diesel application only) that it might not be for everybody. Other than that it does just as advertised.Ditto what ARM says. As quiet if not quieter than stock at steady state cruising. I have absolutley no resonance or drone in the cab at any RPM.