That's what my Magnaflow Street System is like on my 09' G8.
(Kooks middie headers w/cats, x-pipe, mid muffler, & axlebacks)
For some reason it is louder on the road, but quieter at idle than my 08' G8 (Kooks middie headers w/cats, H-Pipe with stock piping to Magnaflow axlebacks.)
H-pipe seems to have a lower tone note than X-pipe, which likely affects what one hears at HWY speeds. Both are not obnoxious, unless you really get on them.