Earplugs get the nod, but something else to consider is having the tips of the pipes angled down 45 degrees. A friend here in Dallas has his that way, and his car is seemingly much quieter than mine. Dont really notice the change unless you check the car out well, in which case (to me) it looks rather odd. Another possible source of the quiet is the fact that my friend is a girly-man who installed a 351C in his rather than a man's motor.
(I can't wait for the small blockers to read this one!)
