stainless manifolds

[Tim Heading2INLA9B]

I'm looking for stainless manifolds for my S4, has anyone used Double S ?

[steveww]

Most people go for mild steel manifolds rather than stainless. Due to the vibration from the old twinc the stainless items ten to crack over time, mild steel being more flexible is more durable in this situation.

A mild steel manifold with a high temp coating will last longer than a stainless one on a twinc. The usual suspects are able to supply these.

[Frank Howard]

Steve,

I purchased my stainless steel exhaust from Christopher Neil

http://www.oakmeremotorgroup.co.uk/lotus

15 years ago and in the summer, my car is used as my daily driver. The exhaust including the stainless steel manifold, is still going strong.

[neilsjuke]

Yes the first had very bad kinks the second took 5 week to turn around and did not fit the head studs 1/2" out and the Y did not fit the down pipes and the rear box is now a lot louder after 2000 miles they are very poor at returning calls/emails = double S#1T



Neil

[cabc26b]

Steve , etal -

I have used both materials. I did not see a failure in the stainless set ( 4into2into1 stock dimensions) the bigbore 4into1 mad of mild is rotting from the inside out - for the next car my concern is a lifetime piece since I am going to make up my own set and i don't think mild will do it ( mild will also embrittle and crack)

do you know what spec was on the stainless that was cracking . My guess is that failed pieces were 304 and not the correct thickness or improperly welded. Any input on alloy to use would be appreciated ( lets leave the 625 inconel off the table at the moment, its nice , but not sure it i can do it this go around)

George

[mark030358]

I had 2 D s exhast manifolds and neither fitted... as per previous post. I bought an excellent one from Paul Matty but expensive....

cheers
Mark

[steveww]

There is a stainless manifold on UK flea bay at the moment.

I only pass the comment along that I was told when I was looking for a big bore manifold. A number of makers I spoke to recommended mild steel for the twinc. May be they just wanted to sell me another in a couple of years