Mike, you'd have to ask Chazz that question. Logistics isn't really our area
Polished floor is exactly the kind of area the 4 gear makes a big difference too, the balance is much more consistant here and drifting the car out of a corner is much easier and predictable!
The shock tower means you can run the positions we've been running for a while i.e. laying the shocks down a little more. We're currently experimenting with the inner hole on the new tower and the inner hole on the wishbone (never previously used) and liking it a lot, the rear end is really 'locked in' as I think Ellis described it.