If it's a pre 2013 demon I'd make sure to have a good supply of QEV diaphragms handy since they do need to be replaced here and there if you get lube on them. Run them dry for the record.
If it's a 2013, or an older one with the 2013 upgrades, it'll be amazing.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents, gaskets, schraders, orings and more F/s[/color]
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S