Car was too loud at the autox. Sound limit is 96 dB, I went past the meter at 102. 5.3L with 2.5" sidepipes into 18" long mufflers that I made. I tried to ape the Burns Stainless super quiet one by welding angle into the flow path in 2 spots at 90 degree angles to each other. I think the problem is that my muffler is pretty small in diameter at 4". Would have done 6", but there just isn't room for it.
I put V band clamps on both ends of the muffler, so I could just swap it out entirely for something else, or add another muffler, or change the tip. My thought right now is to repack with ss steel wool (the fiberglass I put in has apparently left the muffler). Seeing bulk stainless wool on ebay, is that the best place to get it, or is there something better to use? Then add supertrapp tips and just take plates out until it makes the dB requirement. I really don't like supertrapps in general, but that seems to be the most cost effective solution from what I've seen so far.
There are other bullet mufflers that I could just weld a vband flange to and bolt to the back of this one and that might even be cheaper than the trapp, but I'm kind of worried that I won't get enough out of that and then I'll need the something like the trapps on the end of that.