1.6 to 1.8 downpipe question - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-01-2010, 11:01 AM   #1
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Default 1.6 to 1.8 downpipe question

Hi, I am curently boosting on a Garrett T25 on a 1990 1.6L with a

"Exhaust Manifold 1990-1993. 1.6L [66002]"

and

"Stainless Steel Separated Gases Downpipe 1989-1993 [66003]

I realized last week that my crank shaft pulley was starting to wobble....

So I though I could built my self a new B6 into a 1.7L with internal when I realized that I could take a 1.8L and put some internals into it for less than what it would take to over bored the 1.6L...


So I think I'm going to buy this exhaust manifold :

Exhaust Manifold 1994-2005. 1.8L [60003]

But I wanne be sure that my downpipe will still fit onto my T2 outlet onto this exhaust manifold....


Pretty sure I'm note the first one to ask you guys this question!

Thank yoU!
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Old 11-01-2010, 11:23 AM   #2
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Wont work. Need 1.8 downpipe.
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Old 11-01-2010, 11:25 AM   #3
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ok, thanks
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Old 11-02-2010, 05:21 PM   #4
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Quote:
Originally Posted by absRTP View Post
But I wanne be sure that my downpipe will still fit onto my T2 outlet onto this exhaust manifold....
The downpipe will bolt up to the turbo, and it might clear in the tranny tunnel. However, the flange for the exhaust will not fit. You might be able to get a local exhaust shop to make you one. Otherwise, you could send me the 1.6L downpipe and I can rework it to fit a 1.8L. They are very similar, but not exactly the same.
Thanks!
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Old 11-02-2010, 07:11 PM   #5
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Thanks Stephanie,

It wont be a problem for the exhaust

I have a 1.6L downpipe
I have a 1.8L Cat back 2.5" exhaust
And a custom test pipe ...

So I maybe gonna have to do some work onto my actual test pipe :P

Thank you
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Old 11-03-2010, 01:23 PM   #6
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You *might* be able to get a custom cat pipe to fit. Either myself or Enthuza can make a 1.6L flanged inlet and 1.8L flanged outlet. Easy enough to adapt if the downpipe sits in the same location. Just a thought.....
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Old 11-03-2010, 02:35 PM   #7
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Ok thank you alot everybody!
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Old 11-06-2010, 01:07 AM   #8
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yeah FWIW i had a 1.6L mild steel DP, bought a 1.8L stainless begi DP from another forum member.. it was a pain in the *** to install (Because i suck at this stuff) but it fit with no modification.

The only issue was my exhaust was a 1.6L exhaust so i simply had a shop cut off the DP-side flange from the cat and reinstall it at the right position.
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Old 05-02-2011, 02:56 AM   #9
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the 1.6 dp definetly fits no issue at least for me and id say its about equally as hard to install remove. I just dont bother even putting one of those bolts in anymore that saved me quite some time.
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Old 05-04-2011, 04:08 PM   #10
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Awesome! Good to know. Thanks for letting us know.
Stephanie
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