Check out this thread:
http://invision.aleromod.com/index.php?showtopic=285
One recommendation is the SLP exhaust, it does sound low but still raspy. This still might be too low and loud for you though. If so, then the flowmaster (as aleropimp1 recommended) should be a good fit.
You could always check out
google search for "flowmaster sound clips" and listen to the exhausts that way. :thumbsup: