Welcome aboard and congratulation on your new R-Spec...
There are hundreds of threads in this forum that may address your questions in greater detail, but here is a high level summery:
- Unfortunately at this time there is no chip upgrades available for our V8s.
- The closest thing that can be described as performance enhancement is the ESC disable mod., here is the latest incarnation:
http://genesisowners.com/hyundai-genesis-forum/showthread.php?t=14706
- The forum has several members who upgraded their exhaust, and the general consensus is there is negligible gains and some find the 'drone' may not be worth it (so they removed these mod.s)...
- The drop in K&N filter is an easy one just for fun, as there is no off-the-shelf solution available for our V8s...
- Another one would be to change to full synthetic oil as some (me included), feel it makes the engine run quieter and smother...
- Sprint booster is another one of those add-ons that might give the 'feeling' of enhanced performance.
- The Ridgit Collar is another mod that you may find useful:
http://genesisowners.com/hyundai-genesis-forum/showthread.php?t=13126&page=5
Some feel that the R-Spec
badge is a bit of stretch on Hyundai's part, as most of the limited hard data we have suggest that the ECU programming automatically adapts and mostly nullify any intake or exhaust modifications that you may make to your new R-Spec.
Please feel free to search and study the forum, to see if there are somethings which might grab your interest...
Just my two cents and good luck...