Interesting Exh. manifold

**StickyWickett** · 13 October 2014, 16:03

Stroll on that hurts to look at.

**Rusty** · 13 October 2014, 16:30

Love to know any theory behind that...

**SteveH** · 13 October 2014, 16:41

nasty

**rxl** · 13 October 2014, 16:53

what is that? and people do that kind of work and waste time for this ****...

**andy10v** · 13 October 2014, 18:21

Looks kind of like weird version of a Lehmann one

**newsh** · 13 October 2014, 21:15

The price hurts too, 3 grand

**S2central.net** · 13 October 2014, 21:31

That just looks bonkers... WTF ?

**BosnianS2** · 14 October 2014, 06:24

I thought you guys would like that

I really tried to understand how this is supposed to work but i dont get at all. Thise Leehman is also kind of weird. Why do the cyl. 3 and 4 run together and go away from turbo

?

**Rusty** · 14 October 2014, 07:17

From a learned friend of mine:-

It's pulse separated, the firing order is 12453 so the manifold is designed so that no 2 cylinders that fire consecutively are connected to the same pipe at the turbo flange. This helps to get the exhaust out and reduce internal egr, and therefore improves knock performance. Obviously the wastegate pipe connections spoil the pulse separation a bit, but I'm sure it's better than the standard manifold. Pulse separation also means you can run cam timing for scavenging, this reduces turbo lag.

**S2central.net** · 14 October 2014, 07:57

Learnings from the dark arts there... would be nice if there is some scientific proof that all that apparent ugliness translates to a realisable benefit from such theoretical advantages !