I placed my order after reading this thread...Installed mine the other day (Oval) and it exceeded my expectations, sounds awesome... Just enough for someone that wants some sound but no drone or distracting cabin noise for long trips/daily driving. Even with the start/stop, no issues.
I guess my only suggestion for B2 is maybe use some more tape when packaging due to how the item is handled by UPS. Mine was burst open and ready to dump out on arrival.
I shamefully blew the cut at 1-1/4, wound up cutting it like a Pringles potato chip, new blade on a Sawzall just got away from me. Anyway I was lucky and it still worked out without issue, everything lined up and its tight, I also used some Permatex.