I had the bassani X w/o cats and magnaflows on my 2000 GT. I loved it as well, but it is more exotic car sounding, does sound like a nascar at WOT. I could not imagine the magnapacks with this combo, that would be way to loud for my liking indeed. I lost some low end TQ with this set up, but it all was made up on top. IF you have gears you are good to go.
I have the MAC H pipe on my Bullitt, dont know if I got as much power out of this set up, But I like the sound a lot better, plus you done need to replace the stock cat back. Did not lose an ounce of low end tq....
Price: MAC O/R H pipe... 115.00
Magnaflow/Bassani combo over 700.00
I would rather put that extra 500 into gears.
thats my .02
Doug