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Hello!

I was planing to make a new exhaust to my car. What would be the good diameter for that? Is the 3" pipe too big for 3.0l N/A diesel.
 

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'95 E300 DIESEL, '91 600SEL, '92 600SEL
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No point in going that big on a N/A motor. You will be losing torque and power, which is already in short supply on that engine.
 

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'95 E300 DIESEL, '91 600SEL, '92 600SEL
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You want/need some backpressure. Keep it stock size.

If this was a turbo motor, then go as big as you want since the turbo is providing backpressure.
 
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