I have Bassini X. All high end Stainless Steel, all SS not equal. You will also need one 02 sensor extender. I have an extra (sold in pairs) if you need. My Basins came w/ Hi-Flo cats & straight sections if you dont want to run cats. X-pipe will give more HP on top end & H-pipe will give more low end (so Im told).
Just because an X will generally sound more "raspy" it really depends on the combination of the entire exhaust from headers to tail pipe.
gl