94-95 cat fitment on 90-93 Miata - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-20-2008, 08:03 PM   #1
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Default 94-95 cat fitment on 90-93 Miata

Can you make a 94-95 cat fit on a 90-93 Miata by using the 94-95 pipe from the header collector to the cat?
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Old 12-21-2008, 02:13 AM   #2
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no. flanges are different angles. you would need the matching year catback. or a custom exhaust
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Old 12-21-2008, 04:01 AM   #3
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Quote:
Originally Posted by disturbedfan121 View Post
no. flanges are different angles. you would need the matching year catback. or a custom exhaust
thats not correct. The catback is the same for all years between 90-97, I know because I put a 94 catback onto an otherwise stock 90. The difference is on the header/cat flange, which is angled differently. Read his question carefully, he is asking the right question. Now can the intermediate pipe between the header and the cat be swapped on to allow a 1.8 cat to fit? I really dont know the answer.
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Old 12-21-2008, 04:33 AM   #4
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Nick, the cat can be used. The part between header and cat itself needs to correspond with the cat used.

Flyin' Miata : Tech: 1.8 conversion

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If you want to use stock parts, use the upper section of the 1.8 exhaust and the downpipe from the 1.6.
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Old 12-21-2008, 05:22 AM   #5
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Sweet.

So, for anyone searching in the future....
You can use a 1.6 header, 1.8 downpipe, and 1.8 cat OR a 1.8 header, 1.6 downpipe, and 1.6 cat. Both with a 90-97 catback exhaust.
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