Im looking at creating a bit of extra room in the engine bay of my xy falcon, and came across this tubular font suspension setup.

http://www.mcdonaldbrosracing.com.au/tubularwishbones.html

has anyone had any experience with this type of system, that they can comment on?

on some of the earlier falcons, L300 front crossmembers were used with some success. they may be a little narrow for an xy though. have you considered this option ? it makes it so you can pretty much remove the towers fron the engine bay.

Road traffic board frown upon tubular suspension, because it's fabricated[B)] & not factory.
Engineering cert with that setup might cost some bucks too.
Check the RRS stuff out.
I know a few guys with big headed sbf & bbf's in early falcons/mustangs that love this kit;)

http://www.youtube.com/watch?v=kDFke4twWI4

Cheers, Dan