Exhaust manifolds S3
Discussion
Hi all. Just removed the manifolds over the weekend - managed to break one bolt - is this a an imperial thread ?
Secondly which new manifold to choose - stainless or mild steel ???
The existing maifolds have the down pipes inserted into the bottom of them and a clamp holding them in place - this seems a poor method of ensuring a gas tight seal - are there any manifolds where the down pipe goes over the end of the manifold ?
Secondly which new manifold to choose - stainless or mild steel ???
The existing maifolds have the down pipes inserted into the bottom of them and a clamp holding them in place - this seems a poor method of ensuring a gas tight seal - are there any manifolds where the down pipe goes over the end of the manifold ?
Hi,
The mainfolds don't rust anyway because of the high temperature which burns off condensation in seconds after start up but you do get a fine surface rust but it's generally burnt off.
Mild steel is also more forgiving and less prone to cracking, it's also cheaper and if you do need to ever weld it, anyone can do it without the need to find a company who weld stainless steel.
IMHO, it's also best to have mild steel downpipes as they get hit on speed ramps so frequently and again are less prone to cracking. You can spray them with VHT silver paint and they still look nice or better still use manifold wrap to lower those under bonnet temperatures and enhance the performance a little.
The mainfolds don't rust anyway because of the high temperature which burns off condensation in seconds after start up but you do get a fine surface rust but it's generally burnt off.
Mild steel is also more forgiving and less prone to cracking, it's also cheaper and if you do need to ever weld it, anyone can do it without the need to find a company who weld stainless steel.
IMHO, it's also best to have mild steel downpipes as they get hit on speed ramps so frequently and again are less prone to cracking. You can spray them with VHT silver paint and they still look nice or better still use manifold wrap to lower those under bonnet temperatures and enhance the performance a little.
See here ---> www.pistonheads.com/gassing/topic.asp?p=2&f=11&t=80714&h=0&hw=manifolds
I went for Stainless.
I went for Stainless.
Mine are JP which were the same as those sold by ACT but they are cheaper from ACT (work that one out). Mild steel for reasons mentioned above and the downpipes are also JP but I have had them modified with the socket extensions to obtain a really good seal over the exhaust system.
Stainless steel does look nicer and the manifolds go that nice blue shiny colour!
Stainless steel does look nicer and the manifolds go that nice blue shiny colour!
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