get a good one, is all I can say!
I had a cheapo cutout on my V6 car before, with the flappy flap that rotates 90 degrees inside the Y to open / close. It started leaking after just a few weeks, and sound like sh*t when you lift off the throttle.
Some better-made ones have a "gate" that slides in & out rather than rotate, and they seem less prone to leaking.
My car was a V6 (non-turbo), it would sound a little diesel-like from inside at low RPM but really scream (in a good way) at high RPM. The cutout was also right under the passenger seat, before any cat / muffler.
If i had to do it again, I probably would but spend more on the cutout itself ($200-300 seems to be the minimum for a decent system)
I havent looked underneath the EB yet, but if you want an idea of what it would sound like, unbolt a flange after the headers and go for a drive