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Old 04-21-2014, 11:15 AM   #1
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Default Porting MSM manifold

I am about to do the final install of the MSM turbo setup. Looking at the ports where the exhaust gases enter the turbo manifold I noticed that the geometry reduces down right after the gasket and then opens up.

Is there any reason I can't just port this lip out to keep the exhaust flow smooth and not hit this speedbump on the way to the turbo? I am sure it is in there because of the casting process. I do not want to weaken the manifold and have cracks later. It appears that there should be more than enough material left though.

Anyone with MSM experience deal with this before?
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Old 05-07-2014, 01:28 PM   #2
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You might check with the guys on Mazda-Speed.com. If there are any tricks with the MSM stuff, those guys will know them.

My wild *** uninformed opinion is to PORTALLTHETHINGS because its cast, but that's just me
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Old 05-07-2014, 04:22 PM   #3
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Do it....no reason I can see why not
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