Turbo talk.

[Paul Baldwin]

I can't quite make out from the pics if you're t-ing into two pipes before the turbo flange or if you've got a 4 branch collector going on?
Certainly looks like you went to the effort of pairing to firing order.

It's an un-equal length 4-2-1. The cylinders are paired and come together in as smooth a way as I could manage with bits available. We tried to avoid any tight radius's and made a proper 2-1 collector.
As Tom says, velocity is king :-)