I'm sorry it turned out too loud for you... would like to hear it... Looks pretty darn good from your pictures... And the price of 350+ is darn good considering you had to do some fabrication...
I expect the Borla syatem to be in the range of 600+ if they ever deliver the product... AND that's a BIG IF !!!
I had a muffler shop in LA offer to make a custom cat-back system for the car, but opted to wait for the same reasons you are now wanting to return yours...