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Rb30 To Rb25 Extractors

Captain Natro

By Captain Natro,
in Engines & Forced Induction

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Captain Natro Grand Master

Captain Natro

Posted
Posted

Hey guys like many of the NA guys on here ive considered replacing the stock exhust manifold with aftermarket extractors.

but, at 500 a pop this seems a bit excessive. with rb30 extractors being cheap and plentyfull i was wondering if i could use the standard flange off my 25de manifold and have it welded on to the rb30 extractors so the would fit the head?

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https://www.sau.com.au/forums/topic/384386-rb30-to-rb25-extractors/
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zebra Grand Master

zebra

Posted
Posted

possible yes, practical no

trying to cut and weld the cast iron flange would be a mega pain in the butt.

you can buy flange plates form 6-boost/etm/any other manifold fabricator, but iirc the RB30 one wont line up with the 25 ports, so will have to be heated and bent to line up etc.

more trouble than it is worth imo.

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