Just wanted to update that I did this technique and it works. Didn't want to take the chance with muffler type resonators and have it not work. Only cost me $12. No more drone. Drone was bad over a wide range because of the 2.94 gears. Still has nice deep idle and nice wide open sound. But drone is 95% gone. Exhaust is almost too quiet. But it's my wifes car and she wanted it quiet. I did this on a summit 2 1/2" dual exhaust system with manifolds.