One important difference - Billet
	
	
		
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				Originally Posted by 
Kaaaiju
				
			 
			Allisport tried to make ss exhaust work for an while couldn't stop it cracking so they made their cast manifold , had it up to 850c egt and hasn't warped
			
		
	 
 
As with the cracks of on this one
TD5 Exhaust Manifold from China
The joining of the collection pipes on this one and all the other SS manifolds I have seen are the root problem, it is not the SS that cracks it is the welds from what I ascertain. one of the design features I like on the DS manifold are they are all basically ring welds rather than complex ellipsoid welds into tight places. Bet they are each welded as separate tubes and then assembled which would be a hell of a lot easier to ensure the patentcy of the weld at each stage of the assembly.
My choice which will be inspired or the have the manifold expired is based purely on the fact that this particular manifold was the only one I have seen to date for a TD5 which is a tubular design into a billet collector rather than the complex welding involved with the chinese manifolds trying to copy the design of the cast manifold populating ebay. I take your point that Allisport did not succeed with a SS manifold but did they use a billet or make a variation of the cast iron manifold, my bet is the variation of the cast iron style.
I would also add that the Chinese manifolds do not show the coffee colouring of the 316 SS (not the best I understand, but more than close enough) on either side of the welds of the DS SS manifold.
At the end of the day I am after low down torque and if the tubular design do as they meant to and spool quicker, it will go a long way to ensure I reach my 400 NM at 2000 rpm combined with the VNT.
Maybe my little knowledge will be an expensive thing but do actually agree with you that the SS manifolds on the market (which copy the cast style) for $200 odd and WILL CRACK. Here's hoping mine wont!!