Intake:
Injen CAI #SP1727 - $200-300, fits 2007-2008 (and possibly 2009 because there's no engine/layout changes), comes in polished silver or black.
(copied from INjen's site)
Exhaust:
Injen SES #SES1726 - $500+?, 2003, 2004, 2005, 2006, 2007, 2008 Element L4 2.4 60mm Exhaust System w/ S.S. Tip, 2WD/AWD & SC Models
(copied and pasted from Gibson's site)
Gibson #314001 Single Rear Exhaust Kit; Aluminized; Incl. Superflow™ CTF Muffler/Pipes/Stainless Tip/Hangers/Clamps/Hardware; $312.47
Gibson #614001 Single Rear Exhaust Kit; Stainless; Incl. Superflow™ CTF Muffler/Pipes/Stainless Tip/Hangers/Clamps/Hardware; $422.75