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Herr-Kuhn · Joined: 03 Jul 2012 Posts: 30 Location: Northern, KY

You will need a brace on that header to avoid cracking. Hanging an 11 lb turbo from it may cause issues with longevity. You might consider making the header from weld-els (sch 10 or sch 40) to make it much more reliable over the long haul.

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

To be honest I don't know why more people don't use the NA manifold like Raceboy did.

The port sizes aren't too far off what they need to be, and it would be perfect for a true split-pulse set-up right up to a true twin-scroll turbine housing like on some of the EFR's.

Turbo position could be near stock location or on cold side like Raceboy's, or even near the front, with all the system up to the turbo ceramic coated.
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1979 UK 932

nickthompson · Joined: 26 Mar 2013 Posts: 873 Location: Central Georgia

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

NA exhaust manifold actually has better flow than 931 one and it holds up also much better, even with turbocharger and therefore higher exhaust temps.
But machining it is a major pita though. If one wants a budget solution it is an option to consider.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
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