I have searched, quite a lot in fact but it seems the jury is out on this one, so I figured I'd play devil's advocate here a bit in the hope of promoting a healthy discussion. I'm hoping for some reasoned explanations, real world experiences and educated debates ... we'll see what happens.
Right, putting my 'unorthodox' turbo choice aside for a moment, I set out to build my car for torque and a powerful low/midrange. That was why I went with the stroker and chose the Forrester intake over a SMIM.
The Forrester has a very reasonable reputation and is supposed to give an improvement in midrage and top end without sacrificing any low end torque. So sounds ideal for my application. But then I sat and thought that the Forrester was designed around a US spec manifold, so whilst the Forrester might not have any worse performance than a stock 1G or 2G manifold, would it be better for spooling a turbo than the cyclone manifold.
Since I really don't expect to spend much time over 6500-7000 rpms I wondered if I should consider trying the cyclone. My mechanic immediately told me that even if I machined the cyclone to accept the larger throttle body it would become a restriction to my larger intercooler pipes and headwork I have had done. He assures me the Forrester is the biggest favour I can give my big turbo and will help spool up much more than the cyclone.
So, if I want huge torque, full boost at 3000 rpms and I don't care about top end airflow, am I doing this all wrong? Should I have gone 2" with the intercooler piping, stuck with the stock cyclone intake and left the head stock, or are the big bore pipes, spacious intake and polished/ported head going to work in my favour.