[Tag]

The B58 sounds better IMO, but they've really improved the sound of the S58 versus the S55 which sounded raspy and farty in certain RPM ranges. This was due to the S55 having two turbos and therefor two banks of exhaust that were of unequal length. This resulted in the exhaust pulses traveling the length of the exhaust and exiting the tailpipes at uneven intervals. That all changed with the S58, it still has two turbos with two exhaust banks but they are now of equal length. Check out some pics of the G80/2 undercarriage and you'll see one of the exhaust pipes does an odd U shaped bend around the center of the chassis, that's to add extra length to one exhaust bank to make it equal with the other which makes all the difference. The S58 sounds way better than the S55.