You would think there would be a way to get a mellow tone without compromising back pressure.
There is - an absorption type silencer, like the G56. It has to be bigger to provide the required surface area to work effectively, but it's the perfect solution for those comfortable with running a larger than standard exhaust. It is precisely this design desire for a low profile, 'vintage' type look that brought the MMC to design the baffled, restrictive yet quiet stock exhaust. Small, neat, quiet - but horrifically inefficient.
