I had this Magnaflow TRU X installed with Magna Packs on my 08 Mustang Shelby GT CS and they are great. These produced no drone and sound aggressive. This set up just sounds good driving normal, but if you want to wake it up, just push on the pedal harder. This set up will give you the aggressive tone you want, but also will not wake up the neighborhood. I could tell a difference in torque with these. It also increased by fuel mileage by 2 miles to the gallon in the city and on the highway!