You won't lose milage, your turbo will spool faster. But how much louder??????? That I can't answer.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

In some states a turbo IS a muffler. Anything that creates a major restriction/velocity reduction is a form of muffler.

As for N/A Diesels, I've never seen or heard one. But I'd be willing to bet it's much louder than a Turbo model.

It would be a little louder in the car, may set off some car alarms due to resonance frequency.
You should gain mileage unless you put your foot in it.
Small power gain by removing restrictions.

does anyone have a diagram of the 93 300D exhaust system? what i will probably end up doing is remove the cat and the center muffler but leave the rear muffler, my aftermarket muffler...i like the way it looks on the car...so it will be straight pipe from engine bay to rear muffler..

what size piping should i do? 2.5"? 3"? i believe the inlet on my exhaust is 2.5, i'll make sure and i guess i'll just use whatever size the inlet is...

Straight pipe with ram air makes a huge difference, better performance, cooler running, more fuel economy and way better throttle response, at least with a turbo.

do you have this set up currently? do u have pics? i thought about fabricating a some type of cold air/ram air intake for my car and i didnt know what to do with the airbox electronics...anybody have any suggestions?

My ram air setup is quite simple actually, since I have a cylindrical air filter like the one used in MB commercial vehicles, I have just diverted the rubber intake hose toward the grill opening, being quite close to the grill and having a very short path, it gets fresh, oxygen rich air and the performance combined with the straight pipe has increased considerably.

Sorry cant provide you with pictures for now.

I think some nice fat 4" mandrel bent tubing is in order.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

I asked about a N/A engine. That stands for Normally Asperated- ie non turbo.

I missed that part...........................

It will help power, but yes it's gonna be loud.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Hello MTUpower
N/A engine = Naturally Aspirated = non turbo.

Good guess though.