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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > E90 exhaust diameter?



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      03-27-2013, 11:41 AM   #1
JoeRogan
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E90 exhaust diameter?

I'm planning on doing the muffler delete but I want to know before going to a shop what the diameter of the stock exhaust is, so that I can buy my own tip online first. I can't seem to find this info anywhere, anyone know? I've searched a few forums (one night say exhaustively) and somehow no one seems to have needed to know this before lol
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      03-27-2013, 11:47 AM   #2
SDemetris
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go under your car and measure? umm are you talking when its 1 or 2 pipes btw? i think after the resonator its 2.5".. it might be 2.25" though so definitely double check
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      03-27-2013, 12:21 PM   #3
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I would just measure it but it's not like I have verniers I can do it with, and holding up a ruler I feel like I'm just eyeballing it because the pipe will curve away so I could easily be off 1/4". I'm talking about the last section before the muffler under the bumper, I assume that's the one that's removed on the muffler delete
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      03-27-2013, 01:37 PM   #4
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2.25 for the most part.
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      04-02-2013, 11:28 AM   #5
JoeRogan
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It's 2.5". I found out when I went to an exhaust shop to have the muffler cut off last Saturday
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      04-02-2013, 03:09 PM   #6
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Good to know, thanks!
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      04-02-2013, 05:13 PM   #7
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Here is the layout from head-to-toe (literally).... output diameters in (). This is for 325i, 328i, and 330i (n52 engine)... (N54 is considerably different)
Engine (x6 1.5")---> Headers with catalytic converters(x2 2.25") ---> secondary catalytic converters (x2 2.25")---> resonator (x1 2.75")--->muffler (x2 2.25")
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