Re: Maximum Power Achievable with GenII 3SGTE Exhaust Manifold
I think the stock ex mani is the way to go personally unless you're shooting for 350-400KW+
They hardly ever crack or warp, are free (assuming you already have one), are compact and can easily/cheaply be replaced if required.
If I had my previous car these days with E85 available I would continue to run the stock ex mani and prob be up around 400KW mark (30+psi GT35R)
Definitely more power would be realised using a nice hand made equal length manifold etc. But that means $$$, likely cracking at some point and extra heat in the engine bay to manage.
Those are my thoughts anyway.