Because the Healey is notorious for ripping out mufflers, I set out to find the thinnest mufflers possible. Came up with these Spintech Cruisers:
(http://i81.photobucket.com/albums/j222/healeyrick/IMG_0198.jpg)
(http://i81.photobucket.com/albums/j222/healeyrick/IMG_0199.jpg)
They measure 16 x 9 x ........ 2 1/4 in.
Can't wait to hear 'em. Might work for others looking for a muffler solution. Here's the webpage: http://www.spintechmufflers.com/mufflers/street-mufflers/cruiser-mufflers-7000-series/cat_31.html