Any Good ?

[pobiom]

http://cgi.ebay.co.uk/SUBARU-WRX-STi-RA-TU...1QQcmdZViewItem

seems easy to fit and a good price.  Anyone any experience of these or wether they do anything when fitted ?

[ASTiMAN]

These headers don't appear to have any expansion joints, so you could probably expect them to crack one of the welds as they get really hot.

I use Gruppe-S headers on mine which have a slip joint to allow expansion and they are not that much more expensive. I also have a Helix flexi up-pipe (which will be for sale soon due to fitting a Garrett GT rotated turbo).

I would recommend the Gruppe-S headers as they have never caused me any problems. When you remove the standard cast iron headers and sections, you will be amazed at how poorly they mate together from the exhaust ports right the way through, creating turbulance and back pressure through to your turbo. I also ported the Gruppe-S headers at the flanges to match the ported heads on my engine. Definitely will improve airflow and therefore spool up. You will need to heat wrap any headers you put on as well to keep the exhaust gas temperature high to increase flow and also to stop things melting in your engine bay!

 

Kind regards

Andrew

[Dave K]

I agree with Andrew don't get cheap headers; they look like the Megan ones that most people have said split after a while.

I have Gruppe-S headers aswell, better construction etc with the expansion joints, and yes they do make a big difference.

When the car was first mapped the spool up of the turbo came in earlier and a lot harder, so much so that you felt it in the car, I made an extra 30lbft with them.

And I haven't ported the flanges like Andrew yet.[]

Same a V1 Gruppe-S headers; http://cgi.ebay.com/ebaymotors/SUBARU-WRX-...emZ320000938772

Same a V2 Gruppe-S headers; http://cgi.ebay.co.uk/SUBARU-WRX-GC8-GDB-T...5QQcmdZViewItem

I run the V2 style not sure which Andrew has;

[Cret]

Not sure about headers as mine are only std (spare set due to be ported) but I was amazed at the build quality of the megan backbox I bought some time ago.  I was expecting it to be pretty crap due to how cheap it was but the welds were perfect and it has been superb since I've had it.

Not sure why headers need to have a flexi section when standard cast ones don't but perhaps someone can enlightne me on this. Not contradicting, just curious...

[ASTiMAN]

Jim

The standard cast headers have a slip jointed section (which sits in front of the engine in an insulating jacket) that joins the left hand and right hand cast sections. There has to be an allowance for expansion, otherwise things crack wherever the weakest point is.

Kind regards

Andrew

[Dave K]

The quality of the construction is fine, however most people on Scoobynet that have had the headers end up with a blown flexi joint, including Andy Forrest when he tested a set under 1.5bar. So not having a dig at the quality it’s just almost all the cheap units on eBay that are of similar design tend to have a problem with the flexi joint.

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My cast headers also have a flexi joint in the centre joining pipe.