It won't be THAT loud. I run with an open 3" downpipe and it's not bad.

I also got rid of mine. It is not that bad. I just have a straight pipe the entire length of the car.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

When I was running mine sans everything I noticed I started having a hard time hearing my wife. Then again maybe thats just marriage and old age. Seriously tho, it is something to consider.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

I also have a 02 F-350 with a 7.3 diesel that is straight piped its not loud untill you get on it. The muffler will still be in place on the SD.

The turbo actually muffles quite a bit of the noise. A normally aspirated motor will be much louder with mufflers removed than a turbocharged motor.

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'98 E300 turbodiesel

I think the muffler must go as well. I will make sure the tip points to the ground 45deg or so.