Tubi or Capristo for a 360?

I'm talking with my local dealer about potentially adding either a tubi or capristo. Do any of you have one of these installed on your car? Is it worth it? The dealer told me it would cost $5,000 for the installation. How does that price sound? Is there a big difference between a stock 360 and one with a tubi or capristo? And most important of all, the sound will still be the same, just louder, right? If you have any other brand recommendations please share it with me.

Thanks,
Tom