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Just installed this system yesterday with Cobra PowerFlo intake and fi2000 tuner. For reference, I had stock pipes with 4x 1/2" holes drilled on each. The Tri-Pro sounds much better at idle, and on the throttle. Coming off throttle though, there is a very raspy sound to it. Sounds kind of nasty, but not sure if in a good way hah. Overall sound is louder than drilled stockers, but quieter than complete debaffle. I'd guess the noise level is somewhat less than most of the aftermarkets just based on videos I've looked at.
Drilled Stock http://www.youtube.com/watch?v=4MWtfsLERzg
Tri-Pro http://www.youtube.com/watch?v=BBHtGdA-M7U
Drilled Stock http://www.youtube.com/watch?v=4MWtfsLERzg
Tri-Pro http://www.youtube.com/watch?v=BBHtGdA-M7U