A glasspack will mellow the sound more than no muffler at all - certainly better than a straight pipe. Especially if you use one of the long ones with a 30 inch body and 2-1/2 inch core pipe.

And if you install the glasspack "backwards" - turn the internal louvers to where the openings face the back (instead of the front) - they won't pack with soot as much or as fast as if you install them facing forward (the "normal" way)...

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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