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I believe that TSE is having issues with the foundry doing the casting at the moment. So until that is solved, I don't think they are selling manifolds.
For the record, my artech manifold is cracking in the same manner as the manifold Lars built for me.
Between the elbows (or tees) and the exhaust flange?
If so, that is interesting to me, as that was where I had no issues. Now that we got 100% penetration on butt welds, I have had no further problems. I also cut the flange, even though it has been said to not be needed on a welded manifold.
DNM
More like the T with the turbo flange #2 tries to pull the down from the elbow for #1 and the T for #3. Cracking between the T's and elbows, not at the head flange. I never actually had a failure, just cracking, I don't have Lars' manifold anymore as it was sent to his associates for further research.
You might try contacting Kris at KO Racing in Oregon City, OR. He's built and developed John Mann's manifold on his 300hp track car over the years, and he's got it down to be very reliable, with extra bracing and welding in all the areas where any cracking has formed.
I've always said there's two kinds of welded manifolds, those that have cracked, and those that will crack. That being said, I do have a welded manifold on my own car, bolted to an EvoX/MSM hybrid turbo. It uses the stock MSM support bracket to the motor mount, and since it's a long tube/ram horn style, there's more room for it to expand and contrast with heat cycles. Time will tell, but it's held up great so far. I feel like welded log manifolds just aren't a great design for track use, but long tube/ram horn gets a bad rep for being so much weight hanging off the engine. I think they're the key to a lasting track manifold with proper bracing, under hood temp control, and maintenance.
And so my ARTech manifold also crack They all seems to last the same time. Picture here
It had ~7years of track driving so it was to be expected. I wish Abe was still here to make me twinscroll T4 manifold for EFR7163 .....
Shoot me an email. I may have what you want twinscroll wise.