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Sounds a little like my Magnaflows. Stock exhaust manifolds vs headers, stock pipes vs 2 1/2 or 3", and other factors will alter the sound.
Really hard to tell for sure - all anybody can do is guess. Why not go to a cruise night or car show and listen for the sound you want and ask lots of questions.
Terry
i'm running that system on my 383 stroker 78 and it is pretty aggressive. like the ads used to say, not your father's corvette. the advantages (at least in my opinion) with the under car system is that it exits the sound and the heat for the most part out the rear. in addition, it looks stock if that matters with turned down tips, etc. it also makes it a lot easier to ride with the windows down and the heat doesn't radiate up the doors like it does to some extent with side pipes.