Sasha is offering the split dump pipe for sale here
http://www.gtir.com.au/products.htm
But like I say it would be made by a different exhaust maker, so I can't guarantee it would be the same
The problem I am having is probably due to the stainless manifold, but I will be reccomending to Sasha to move the flexi join 1cm nearer to the engine if he was ever to have them made again, just to ensure the problem never arises for anyone else.
As an aside I took the car for another short blast today. Warmed up the oil and got full revs in 4th, came home and popped the bonnet. Where was the hot blast of air? It was positively cool under there. I spat on the manifold and it didn't bubble at all, so I got brave and licked my finger and gave it a quick pass over the manifold. Yes there was warmth there but not finger burning heat by any means. I like this ceramic coating