How much are they charging for the unit when they do a custom batch? I presently have a 1-piece that is about 7 years old and may need replacement someday. Back when I got it, I paid US$420, which is probably less than I would have spent on 4 crappy ANSA mufflers over the same time period!
How well do the 2-piece units fit together? How well do they seal? Exhaust leaks are annoying!