What am I missing?

[McMahon]

I'm boosting my KA24DE S13.

Here's my shopping list, with check marks on the things I've already purchased.
☑ Garrett Super 60 Turbo
☑ Tial 38mm Wastegate w/ 6PSI Spring
☑ Chipped ECU w/ Basemap
☑ 370cc Injectors (May need bigger)
☑ Turbo Manifold
☑ Boost Gauge
☑ Oil Pressure Gauge w/ Warning
☑ Wideband
☐ Downpipe
☑ FMIC
☐ FMIC Piping
☐ Turbo Elbow
☑ Full 3" Exhaust
☐ New Clutch
☐ Air Filter
☐ Oil Feed Lines

Am I missing anything, or is there anything I should do to be safe? I.E.: Gaskets or head studs, etc.

[McMahon]

Nobody knows?

[McMahon]

Thanks for the help...