ThomWilliams

hi all,

Looking for some GReddy experts. I’ve looked through previous threads and can’t make my mind up on if this manifold is a fake or not. Taken lots of photos so hopefully it’s easy to tell.

I’ve been sold this as a genuine GReddy intake

The previous owner had it recently soda blasted which makes it harder to tell.

Any help would be much appreciated!

Dboyizmlg

Looks legit to me

97nismo

Even soda blasted the casting looks rough

If it’s a real greddy I wouldn’t run it

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TheRealSy90

It's a cast manifold, of course it looks "rough".
I can tell it's a real Greddy based off of the fittings at the rear end of the plenum. They used basically some sort of proprietary or discontinued fittings as i've tried to find exact matches before and couldn't. I'd bet on that one being real.
Also, clean it up and sell it if you aren't making 500hp cause the stock manifold will make more torque lol.

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jedi03

i say run it! makes the top end so much nicer! plus makes working on the engine/oil changes a dream compared to the stock manifold!

tuzzio

If you understood the cost / resources it takes to make a sand casting have a beautiful surface finish, you'd understand why it isn't more common. Unless you get into investment casting, which again, costs more money.

I'd like to see what tools you find available to get in there to clean any parting lines you feel aren't necessary where the cope/drag come together.

Also, some flow bench results on how you improved the overall process/product.

Car people have higher expectations for sand castings than aerospace components require.

jumpman2334

i dont think extrude honing is that expensive. it can get into every nook and cranny (no porting tools required).