I bought a Fiesta ST from a dealer last weekend and I believe it has a resonator delete. The car is louder than stock and has some light burbles when I let off the gas, but the stock exhaust tips and the muffler right behind them. I am considering a Catback system at some point but am curious as to if this will make the car louder, quieter, or equal in volume as members of my household have already commented that they could hear me from down the road. Before buying the car I was considering the MBRP, Cobb, and Flowmaster. My concern is that the MBRP will live up to its reputation of being too loud. I do like the noise level with the car; its not too loud or too quiet. How would these exhausts compare to my current setup?