What you just described is the borla catback, you cant find any welding unless you put your head under the car, the chrome tips are bigger than factory, shinier (chrome) and sound thrilling, it is the true mustang sound IMO. drone does NOT exist, although around 2 rpm the sound gets thicker, but I don't think you can call that drone. I was actually scared about the drone thing, but I am so happy about it, I got it yesterday, it was expensive, and I love it, wouldn't trade them for the world. good luck
2005 Mustang GT Coupe RedFire Premium.
Borla Cat-Back Exhaust System.(True Muscle Sound IMO)