Really man....You're going to have to use the search on the forum before posting. There are several threads here posting top upgrades.
Check out TCFab, Most will agree that everything he has to offer for our rides is on point.
D3 claims to offer the STS-V goodies but in reality most of them are no longer available directly from D3. (try e-bay)
The only other intake offered is the Spectre. This unit is almost exactly the same as D3's offering but it cost is fractional and uses a sleeve to trick the MAF sensor rather than the $500 "D-tronic" unit that D3 sells.
Exhaust options are limited as well. Borla, Gibson, and Corsa are bolt on units. Cut outs and custom set ups are other options.
The most important thing you'll find is that the trans tune is a big game changer in releasing the power from even the stock drivetrain. I chose HP-tuners for this with a TCFab tune installed.