You're also comparing an EWG turbo vs an IWG turbo. They're shorter when you don't use an internal gate housing.
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OP stated he wanted IWG.

 

yep, i want iwg unless absolutely impossible. nice short log and iwg should minimize heat, weight and labor and maximize durability.

 

I stand corrected.. I thought the evo8/9 inlet flange for the turbine housing was a t3 twin scroll but it's not. Either way, for a smaller log manifold with a t3 flange, I'm not sure a divided/twin scroll housing make a big difference and is necessarily worth it.

 

I would certainly be interested to see how a setup like this did. I wonder if you removed the oem oil cooler and used an oil filter relocation kit you would have enough room to fit a borg warner EFR turbo..? The actuator arm and bracket for the IWG would obviously need to be moved, but making a new bracket and modifying the rod is trivial if you can get it to fit. The simplicity of an IWG setup is very appealing over an EWG setup. Some people claim to have issues with the IWG regulating boost but that seems to be a problem for many manifolds w/ EWG's as well.

 

Technically, it's an Evo X turbine housing Mirror image of the Evo 8/9. Evo 8/9 is reverse rotation turbo while the Evo X is regular rotation, hence the mirror image of the flanges. Anyway, it's not the turbine housing that is the issue as guys with Evo Xs are making 550-600whp with bolt-on GTX3576Rs using that exact same turbine housing. The issue with the SOS setup is the manifold. Because their kit keeps the stock S2000 engine mounts, it pushes the turbo up which means there's not space to make a manifold with a gentle bend into the turbo. So the exhaust gas has to make a nasty sharp turn from the manifold into the turbo which is choking off the top-end power. Personally, if doing the SOS kit, I'd do the GTX3071R in the smaller 0.73 A/R turbine housing to maximize spool as the manifold is going to choke off the top-end anyways.

 

There is one other option I'm considering. Something like this:


My turbine housing will be done for, but in return it will have best of both worlds.
Now if someone can tell me how well SS welds to cast iron?

 

A member on here steven is running an EFR on a top mount tubular manifold. I have actually been talking to him about doing some testing with my car as well and getting a manifold from him. All billet flange, thick 321 stainless, very very nice manifold unlike 99% of the companies that are out there currently. Short runners for increased spool and response, less prone to cracking. By the sounds of it if you want to do the EFR you should look into this. BOttom mount it will not happen... so either you need to do a custom top mount like steven622 I believe his user name is or full race sells an EFR sidewinder/front mounted manifold as well. Either will work great. Keep in mind with the top mount you will need to have your battery and fuse box fully relocated so if youre not tucked aready just go buy the Full-Race EFR Sidewinder and call it a day. #endrant #discussionover lol http://www.full-race.com/store/efr-t...rbo-kit-1.html