I Never had it without the vibrant resonator. I replaced the MBRP muffler with a Magnaflow "magnapack" and put the 12" resonator on the exhaust all at the same time. I wish I would have gone with the Large body resonator though because the car was extremely loud with the DHM manifold, EFR, DHM catless downpipe, and that modified exhaust. with both the muffler and resonator on the exhaust it was louder than the MBRP Muffler. but although it was louder there was less drone than with the MBRP exhaust the way it was right out of the box. but my custom one still needed a bigger resonator.