Depends: AWD or RWD, dig or roll, fastest to a given speed or top end, GTI or R, manual or DSG?
One way to look at it is by power to weight ratio (PTW). This doesn't tell the whole truth due to so many different factors, but it can give an educated guess..
Power to weight ratios were created using the lowest weight/2WD/BHP
Kia Stinger:
Basic Google search 3600lbs-4020lbs.
Stock BHP- 365 (I believe underrated)
PTW~223.5
JB4/stage 2- ~442bhp - 549bhp
PTW~270.5 - 336.2
(Believe the most powerful Stinger is 700bhp)
PTW~428.6
GTI:
Basic Google search 3100lbs-3300lbs
Stock BHP- 220
PTW~156.4
IS20
JB4/stage 2- ~352bhp
PTW~250.3
Spicy stage 2- ~409bhp
PTW~290.8
IS38
JB4/ stage 2- ~442bhp
PTW~315.05
Spicy stage 2- ~483bhp
PTW~343.4
Big turbo
I've seen 490bhp-700bhp
PTW~348.4 - 497.8
WHP numbers came from multiple dyno videos on YouTube or provided dyno graphs and then averaged out.
This site was used to determine WHP to BHP.
https://www.mk5cortinaestate.co.uk/calculator4.php
This site was used to determine PTW ratio-
https://www.launchtech.co.uk/bhp-calculator/