Subaru exhaust manifolds

Rapidresto · Posted: Tue Nov 20, 2007 9:59 am Post subject: Subaru exhaust manifolds

Any idea on cross compatibility accross the engine range?

I'm looking at various exhaust manifolds on ebay etc to form the basis of my exhaust system.

I've got a na ej20 from a legacy and i'm looking at stock manifolds from a 2.5 outback or even 2.2 or 2.0 turbo manifolds.

The manifold to head flanges look similar, but are the engines different widths etc like you'd find on a vw stroker etc!

cheers
john

doppelganger · Posted: Tue Nov 20, 2007 5:08 pm Post subject:

if its ej it will fit the blocks are all the same size Wink

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ElusiveStranger · Posted: Tue Nov 20, 2007 6:34 pm Post subject:

WHS^^^^

You will find that a turbo manifold gives you greater ground clearance than a NA manifold. The "angles of dangle" and exhaust port lengths are different.
Moding a stock manifold will also give you more. There's a few photos on Aussies by Subaru Boxer showing how to do this.

However, Scooby manifolds are pants (#1) as they're very unequal lengths and don't promote scavenging.

#1 Mine seems ok but I'll be making a proper SS equal length system at somepoint. Mine's just stock NA header into some Jetex bends and an Astra (I think) back box.

'Ere are: http://www.vwkd.co.uk/bb/viewtopic.php?t=288

Having the stock 4-1 seems to work better than having the LHS pots into one can & the RHS pots into another.
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doppelganger · Posted: Tue Nov 20, 2007 7:00 pm Post subject:

what you really want is equal length headers like mine Laugh Out Loud

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Rapidresto · Posted: Tue Nov 20, 2007 8:07 pm Post subject:

cheers guys, i'll prob go the stock header route to get it all up and running then look for something more exotic Grin

Ianbott · Posted: Wed Nov 21, 2007 8:58 pm Post subject:

doppelganger · Posted: Wed Nov 21, 2007 9:06 pm Post subject:

yes

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Rapidresto · Posted: Wed Nov 21, 2007 9:47 pm Post subject:

pair of tvr cans off vzi if i'm not mistaken?

doppelganger · Posted: Wed Nov 21, 2007 9:55 pm Post subject:

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ElusiveStranger · Posted: Wed Nov 21, 2007 11:42 pm Post subject:

doppelganger · Posted: Wed Nov 21, 2007 11:49 pm Post subject:

pretty much what you see really swap them over so they point out back with about 18"of pipe and a welded on supertrapp on each one,very noisy mind Laugh Out Loud

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ElusiveStranger · Posted: Wed Nov 21, 2007 11:52 pm Post subject:

So one can's linked to 1 & 3 (VW notation on cylinders) and the other on 2 & 4?

_________________
The advice you receive on here is worth the paper it's written on.
Your experiences are worth shed loads to others, including the f'ups - live and learn.
Wouldn't YOU rather learn by someone else's mistakes? So would they.

'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
I don't lean forward for hills any more Grin

Bugger, missed out on "Live fast, die young"