There are even more exhaust options for 04-08 G then listed. I personally ran a Capristo, dyno may still be on their website, I believe it's in the +28HP gains too. A great sounding exhaust, less F1 compared to say a Kreisegg, and with remote valve control.

Regarding air intakes, Carbonio is just a remake of the OEM , I had one, the weave did not match OEM and it yellowed quickly. Others make CF OEM replacements like RSC that match OEM CF and do not yellow. As these are just OEM remakes, do not expect any perf gains. Tecnocraft as well as the 2 below are the only "modified" intakes I know for the 04-08 G, outside going with a TT build.

My friend runs this, great looking box!
GruppeM Intake: Lamborghini Gallardo (coupe only) (V10-5.0L, 2004-)

Heres another im not familiar with, albeit a diff approach:
OTA - OVAL TRUMPET AIRBOX ACOTASP-14 | BMC AIR FILTERS