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I've been running a GT3040 turbo for years now and recently made just under 500 at the wheels with it on 22psi of boost.

I'm thinking that it's probably pretty efficient right about now but I doubt there is much left in it. I always want more bottom end so I was thinking about twin scroll housings..

The manifold it's perched on was built for a twin scroll flange but I only ever had a open flange rear housing on it except for years ago when I had a diesel rear housing on the 3040 that killed 100hp.

Anyway, I see Garrett offer a twin scroll housing for a GT30 turbo and I'm wondering if the gains in response would be worth switching housings for? Or, will the twin scroll housing cause restriction?

Any one know anything or tested this?

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