Anyone know EJ18 exhaust diameter?

Try to keep it somewhat clean and reasonably PC

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Anyone know EJ18 exhaust diameter?

Postby grossgary on Mon Dec 16, 2013 8:15 am

Anyone know the stock exhaust diameter for EJ18's?

I searched multiple Subaru forums, saw a few guesses, but nothing certain.
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Re: Anyone know EJ18 exhaust diameter?

Postby Huck369 on Mon Dec 16, 2013 12:56 pm

Pretty sure it's the same as the early 2 port EJ22's...(but I don't know what that is either...) :roll:
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Re: Anyone know EJ18 exhaust diameter?

Postby grossgary on Mon Dec 16, 2013 8:50 pm

Huck369 wrote:Pretty sure it's the same as the early 2 port EJ22's...(but I don't know what that is either...) :roll:

you're right beast!

all EJ25, EJ22, and EJ18 are the same - 1 7/8". i wouldn't have guessed that.

exhaust rusted off my EJ18 swapped Legacy (originally with EJ25). I was going to install a size smaller pipe to match the EJ18 exhaust...but it's the same.

Maybe i should reduce it to 1.5" to help the EJ18 out a little bit. LOL
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Re: Anyone know EJ18 exhaust diameter?

Postby Huck369 on Tue Dec 17, 2013 7:08 am

There "Might" be a header still on one of those 2 EA18 I have stored (Haven't looked at them in a couple years :shock: )
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Re: Anyone know EJ18 exhaust diameter?

Postby grossgary on Tue Dec 17, 2013 8:22 am

Huck369 wrote:There "Might" be a header still on one of those 2 EA18 I have stored (Haven't looked at them in a couple years :shock: )

oh thanks, actually the exhaust manifold is okay. i'm not sure why but the rust out here destroys the rear of the exhaust first - mid pipes, converters, mufflers and pipes. the ypipes often take much longer to rust out for some reason.
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