And please - I didn't mean to come off so harsh to you, Brian. That was indeed a VERY poor choice of words . . . and I apologize.
I do recall, at several of the Houston Autoramas, Mike under his BG car, scrubbing, cleaning and fussing around. Same as I used to do on my '75, only 100 times more . . .
Any way - back to the exhuast - as Mike was prepping the car, every year, I watched him working tirelessly along the entire length of that exhaust system, polishing it with finer and finer wads of steel wool . . .
The thought never crossed my mind that it might not be a GM system. I need to ask him - he'll recall . . .