I was really looking more an answer with actual numbers...

Like it starts to spool 500 RPMs lower and makes 2 PSI more boost at 2000 RPMs - something like that...

I'm VERY seriously thinking of removing both resonator AND muffler and putting a straight pipe with a straight-through glasspack muffler on mine. That would give the spooling benefits of a completely straight pipe, but still have a little sound deadening.

My truck has a straight pipe, and with the turbo it isn't terribly loud nor does it drone obnoxiously. I "raps" pretty good when you really get on it, and when compression braking, but otherwise sounds pretty good.

However, even though its exhaust pipe is nearly twice the length of the one on the MB's it is still louder than I'd want my MB to be...

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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown