Hyundai has improved significantly over last few years:
Sonata: highest rated midsize initial quality - JD power rating
Santa Fe: one of the highest rated SUV - JD power
LSD from Spec V can fit into Tiburon. There are S/C kit available for the car so potential is there. Tiburon V6 can run mid 14s with BPU. I have seen a video of 14.4 run. It trapped around 97-98mph, which is faster than stock WRX (93-95mph).