So, Mazda has a new header design for their SkyActiv turbo engines. it joins cylinders two and three in the same long-tube primary, and leaves 1 and 4 by themselves. I'm going to try building a turbo header along these lines with the same flange as our VJ's and report my findings. if it pans out, I'm going to start selling them. I'm still taking orders on 2.25 exhaust kits, mind you, so let me know if you're interested, people!