[RICE RACING]

I have stacks of individual flanges in SS per rotor (E-Mail me for price).

My thoughts on your questions:
I have made every type of manifold known to man and probably more.
In turbo cars it makes 2/5ths of fuck all difference at the end of the day.
Make the manifold SHORT and DIRECT and SPLIT PULSE. As short as it needs to be to fit your turbo where it will go! this on its own will dictate that any "theory" on runner length is nothing more than internet bullshit.

Don't worry so much about "tuned lengths" as these theories do NOT apply to turbo systems.

Shortness is your friend on a turbo set up.

I have seen pretty much everything in my life on these pieces of shit and one of the highest power cars I ever seen in my life had a fucken box section manifold on it!!!!! true story!!!!

Don't loose ANY sleep over it, trust me.