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first off, sorry if you contacted us and someone forgot to get back. we are a small shop and this is the busiest time of the year. the last couple months have been hectic with our small crew.
to get the trans tunnel properly fit, I would suggest engine mounted, front cross member notched (depending on which crank damper you use) and an intake manifold installed. intake manifolds get very close to the brake booster and clutch master so you take it as close as you can so you can get the drive shaft angle as close to in spec as possible. the cd009 is so large in the center that the floor can barely be manipulated enough for it to fit. the metal just doesn't have anymore stretch to it. some spots can be 1/8" clearance or less when finished. the poly mounts all around limit movement well enough that 1/8" or so is enough of an air gap.
we have not done a swap without using our custom motec firmware to retain all of the factory functions, so im not sure what it would take to keep ac functionality with another setup. The hoses end up routing a few different ways depending on exhaust manifold and turbo setup. we build them to spec once all of the hot side parts are installed so we can route them as far away as possible. Heater lines are a little tricky, but do-able. also routing depends on hot side parts.
we usually have a cd009 in and out 7 or 8 times during the floor modification phase to get it right, and get the angles correct.
every 2jz drop out we have received had almost useless factory twins on them. from shaft play to crumbling vacuum hoses. fitment is much easier and way cleaner/easier to work on with a single. there are a ton of budget singe turbo exhaust manifolds out there, and a 62-66mm borg turbo can be had from $200 used to under $1k new.
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