I wonder if someone could tell me please, are the backboxes the same on the 40 and the S, or is the S box different? Is there anything else that makes the S exhaust sound the way it does, namely the cracks and pops on the overrun. My 40 has the typical DSG farts, and sounds ok, but would like to man it up a little bit if I can, without going too Big Boy Roy of course.
Thanks.