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What exhaust manifold do I have?

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Built_for_Boost

Probationary Member
26
3
Aug 29, 2015
Annapolis, Maryland
Hey Everyone,

I have another question again, shocker, I know. So I recently purchased my turbo for my build (mhi tdo6h 20g) and everyone keeps saying "Just buy a 2g exhaust manifold and port it" I was about to do that when I took a second look at my manifold. I could be mistaken, but according to this website:http://vfaq.com/mods/exhman.html , I started to notice some similarities between the 2g and my manifold. If anyone could clear this up, it would be great, because I don't want to buy a new manifold if I already have it.
 

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Ok, so thats good. Any idea if it has been ported? Looks like it hasn't to me, but I don't really know what I'm talking about:idontknow:
 
The manifold pictured is not ported. A ported manifold will often remove the step in the manifold where the fire ring was that mates to the turbo. Also, the shape of the collector in the center is often re-shaped. Here is a example of a ported manifold: (left-ported, right-unported)
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So is it as big of a deal to port the manifold as people say? I don't own the tools or knowledge to do it, so I would have to send it out to someone. Do people on tuners port manifolds if I sent it to them?I would like to get the most out of my turbo. Thanks
 
Porting the exhaust manifold will slightly decrease spool time. The best bang for your dollar in my opinion on a street-driven car utilizing an internally waste-gated MHI turbo would be an EVOIII exhaust manifold and o2 housing.
Reasons:
  • Economically viable
  • quality material for longevity
  • Portable
  • Good flow and proven effectiveness
  • Retain stock heat shields (some modification on low shield for o2 sensor for 2g)
  • OE fitment
  • Less prone to cracking
 
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it usually is a good idea to port it, and you can do it all yourself for cheep, and you will have the tools to do some other cool custom stuff in the future, which is why it would be more cost effective to just buy a grinding tool, some bits, eye protection ,some gloves, and then just DIY the thing... Of course do some research on how to do it right, it's not exactly rocket science or anything, but it does take a steady hand, and an eye for what you don't want to mess up.
 
I'll do some research on diy porting. From what I've read, isn't a ported 2g almost the exact same as a e3 exhaust manifold. I know e3 manifolds are stronger because of build materials, but if my 2g is in perfect condition, why not use it and save the money.
 
it usually is a good idea to port it, and you can do it all yourself for cheep, and you will have the tools to do some other cool custom stuff in the future, which is why it would be more cost effective to just buy a grinding tool, some bits, eye protection ,some gloves, and then just DIY the thing... Of course do some research on how to do it right, it's not exactly rocket science or anything, but it does take a steady hand, and an eye for what you don't want to mess up.
I agree considering the 16g is a very fast spooling turbo no loss is spool will be knotice!
 
I also need the manifold to be externally gated if that changes anything about one being better than another. Either one will have to have the flange for my wastegate welded on, probably on one of the runners, if that's the correct term. It's not ideal, but it's what I can afford. I've heard welding onto these manifolds is not a good idea, is it even worth my time to try, or is it a waste of my money?
 
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