I have calmini mandrel bent 2.25" pipes on my Xterra with a flowmaster 40 series. LOVE IT! Not to much..........but definately not to little. Granted it isn't a dual exhaust Silverado V-8 but it sounds pretty nice on acceleration or low end torque work. I also added the K&N FIPK and that has helped with growl as well.

I had the Dynomax Turbo muffler originally with my Calmini system....switched it out for a Flowmaster and have never looked back. You wont be dissapointed.