I had a magnaflow 14815 Street series muffler installed last week. I left the resonator intact to avoid drone, but I still get just a little under load --nothing turning up the radio doesn't fix
. The muffler has not completely broken in yet, of course, but I am starting to notice some crackles on downshifts in "DS"
. For right now, I'm leaving the tips as they are, but will most likely have them cut and welded on to be more straight out the back.