350 max your box will give out first
td05 are old turbos now , good if you get a rebuilt one
vf23 good turbo ! Vf28 is hardcore for track use , the existing td04 gives loads of spool when mapped and can take punishment
but with tracks
your brakes need to be **** hot and take a lot of punishment
suspension .... Need to be tight like a tiger , nothing worse than loosing power in the bends from body roll or trying get back to a nice line
then weight and what drains your engine , ditch the ac for one !