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Zetec Header to SPI?

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Possibly found an OBX 4-1 Header...Questions...

-Will it fit my SPI, or would I have to move the flanges?
-Is it worth getting?
-To get the most, would I need to do an exhaust system?
-This would help breath easier correct? MPG?

It is N/A and from a zetec, never installed.
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Headers do help MPG, but the exhaust ports on a ZETEC don't match the SPI meaning the head flange won't work not to mention if the firing order matches.
The Escort GT header is really the only option without getting a head flange from JGS Tools and building it yourself.
 
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