If it's still under plan then it's really your only choice and it is a great sounding exhaust. If your car is out of plan then go aftermarket, have a full bolt on exhaust made up so you can keep the stock exhaust in storage for if you ever sell.
That's just the rear muffler, not he whole exhaust? In that case I'd just do an OEM mod on an existing one, or just get a spare to mod and keep the existing one.
To me it wasnt worth the 35k. Sitting in my garage. Sounded crap with an xpipe - a total raspy mess. I will probably put it back one day though out of boredom because i liked the look of it. If you can still get the ACS back boxes... Get that. Sounds superb.