I have been watching this post, by the way I liked the Mikey muffler..

Anyway, way back when...... I built a 27 "T" short p-up. I was in high school in northern Michigan. OUT IN THE BOONEY PINES. Closest town was 600 people. Back to story. Back then the roadsters in the magazines seemed to all have the side pipes up high. So I made the pipes from some old Ford torque tubes. I took a piece of 2 1/4 exhaust tubing and with a band saw made a zillion cuts about 1 1/2" across the tube about 2 inches apart down each tube. Staggered on both sides of the tube. Then I took a ball pein hammer and smacked each cut, to drive one side of the cut part into the tube about 3/8". Welded a ring on each end 2 1/4" ID and t-tube ID/OD. Wrapped this with that NEW Fiberglass body matte and some furnace tape. Slid the assembly into the t-tubes, retained with a 1/4" bolt from backside. VIOLA!! instant mufflers (kinda). Any ways it quieted down that mighty 364 nailhead. I still have discolored skin above the inner elbows from touching those things while reaching outside the car while driving. DANG! that smarts!!