I recently had to remove the left rear muffler. (Repaired power antenna)
 The Y pipe was rusted and needed replacement.  It turns out that the Y
pipe is 2.5".  The stainless steel mufflers are in great shape and I'd
like to keep them.  They are not marked and I would guess about 12 years
old.  Is there any way to figure out the manufacturer?  Is it possible
that the 2.5" Borla would fit?  Thanks in advance.

Jack