I apologise for not responding sooner but things have been quite insane around here what with getting ready for the London car show and also trying to move my home. I had no idea how much crap I could possibly accumulate in 20 years.
The turbos are Ball bearing T3-T4 hybrids with a custom A/R ratio and a custom trim coefficient which I will post later for those interested. The turbos are both oil and water cooled with variable wastegates and internally exhausted BOV's. Minimizing back pressure while the engine still maintains 10;1 compression ratio with good bottom end response and simply mind blowing response from about 3000 rpm through 8000. The engine also has a 5 stage dry sump sytem by Petersen and all internal fasteners are ARP with ACL bearings, forged pistons and forged H beam rods. It also has custom ground camshafts, Walbro fuel pumps, high impedence injectors, L19 head studs, rising rate fuel regulator, custom schedule 10 stainless manifolds, upgraded fuel rails, Cometic head gaskets, and so on and so on. It wasnt cheap but boy does it go!