Has anyone tried those cheap manifolds they sell on ebay ?

Pity they are made from s/s though:

VG30DETT TWIN TURBO T25/T28 T-304 STAINLESS STEEL MANIFOLD

MEGAN Stainless T25 T28 Twin Turbo Manifold for 300zx VG30Dett

 

They look familiar.

I was pretty much responsible for these being made.
The sleeve in the main pipe just after the center runner, and the angled center runner was my design. (an attempt to get the center runner to flow better)
The quality of these is poor and it's a big job if they crack

Personally, I think the AMS manifolds are a much better option @ $350'ish USD.

Pretty sure I still have a set laying around somewhere.

Going back a bit as it was ten years ago when I was working on these, I think it was DUB who tested these.
I lost interest as soon as the Mike Smith and AMS manifolds were made.
Kinda surprised they're being mass produced now ten years later.

 

As for SS manifolds you will need brackets to brace them up, and most importantly flex exhaust pipe after dump pipes. All warped up in exhaust heat wrap.

Those don't have cut in the flange so you will have to cut the flange for the dipstick oil level tube.

And if you wanna make it "crack prof" just weld the small peaces of SS over the existing welds. Pain in the arse job but worth wile.

 

http://www.ebay.com.au/itm/EXHAUST-...417629?hash=item463c99b75d:g:KZcAAOSwk0pVgN-R

I think these are the best option for stainless manifolds, made from thick walled 304 stainless steel, with a 5 year anti-crack warranty.

THICK WALLED are the key words here when talking 304 stainless, plus if they don't crack after 5 years then probably wont.

 

Heat wrap will actually induce cracking by increasing egt, flex joints are a good idea but 304 manifolds don't normally crack from weight they crack from heat, think walled 304 solves these problems.

 

http://www.burnsstainless.com/technology-turboheaders.aspx

heres a link to some good stainless turbo manifold science while he does push 321 stainless a fair bit, gives a idea why thin walled 304 cracks.

 

Think you will find

These are all made in the same factory in China.

Biggest issue with these is not so much the design or the welds, but the sub-standard material they make them from.

 

And here's the problem they look the same must be the same ,while looking the same the fine print tells other wise THICK WALLED 304 this is the difference that's why i put it in capitals:bash:

 

so what your saying is the same factory does a run of thin walled 304 and a run of thick walled 304, I find that very hard to believe. Or maybe NPOWER are lying and are really selling thin walled 304 advertised as thick walled 304 also find that hard to believe as they back it up with 5 year no crack warranty.

Does anybody have a picture or link to a cracked vg30dett stainless manifold based on this design would love to see were they crack? If in fact they have ever cracked.

 

If someone can tell me where to get Inconel tubing and plate from I'll

give it a try

 

use 321 stainless

 

Try here

http://www.australwright.com.au/

http://www.specialtymetals.com.au/

 

If they do crack under warranty, I bet they won't pay for the engine R&R to replace them.

That would make the extra $250-$300 for cast manifolds appear to be very cheap.

 

Yes you are right there.
Those are all made in one factory, only badges are changed for different customers.
However minimum ordered qty's are in hundreds and however is ordering is doing a good business (considering the markup on them)... And yeah they are on repeat order every few mounts.
I got my set out of one huge order. SS is quite thick, welds are looking really good and I have no issues experimenting with them. Of course I have done few extra thing on them to ensure that I eliminated cracking as much it is possible.
And I would advice anyone who is thinking about SS manifolds to do few extra steps, as yeah they might crack. With that said same goes for any other material.

 

don't touch them , they're designed wrong as well ,

 

Can somebody/anybody post a pic or a link to vg30dett stainless manifolds based on this design that have cracked. I cant find any myself just people saying they will crack. Wheres the evidence.