Where did you get those exhaust pipes?  Your picture
doesn't look at all like mine.
I got mine from Nieco about 1995.  Heat muff is on the right side.

Bob,

 

Hmmmm.... I see from the FAA registry that you have a 320 - all the 360's I've seen have the muff on the header from cyl #1.  I did get my exhaust from Lancair as early as 1990 and once again in 2002 (don't ask).   I think a company called Snow was the fabricator.  Aerocrafters doesn't list exhaust systems for 320s and I can't remember if mine was referred to as Type IV or Type V (Roman numerals were used frequently over the last 2000 or so years).