Hi. I'm the person Mark mentioned.
I've got a 5 I'm about to break, and its got a VERY cool 480 Turbo converted 5, albeit with a suspected blown HG.
It's got a GT28RS turbo, Emerald aftermarket engine management (MAF-less and running a coilpack), loom n sensors to suit, bigger injectors possibly, full 2.5in (or more, unsure as yet) turbo back exhaust, full custom boost pipes, Pro Alloy front mount, rad n fans to suit, oil cooler, remote oil filter, electronic boost controller, the whole lot.
There's more too, but that lot suits what you were after.