I just installed my Capristo exhausts and its fantastic! I can easily feel the gain in the hp especially since mine is a 2.7L. :hilarious: BUT, I do have a problem, when I'm driving between 2,200 - 2,400rpm, there is a very loud sound coming in from the exhausts and it can get irritating after some time. It sounded like a booming sound inside the cabin, but from what I heard, Capristo exhausts shouldn't have any resonance or droning. Anyone else experienced this problem? Does the exhaust needs time to run in? But when the valves open above 3,000RPM, the exhaust is singing music to my ears.....