Originally Posted by OptionZero

not on top of it, i'm not sure if thats even structurally sound
i have seen people pair it with chassis-mount wings, but thats quite the commitment

I think you're looking for options that don't exist

Here's your choices:
1) live with the OEM wing
2) pay a local shop, custom mount a gurney flap or extension
3) chassis mount
4) remove it, fill the holes, put any spoiler you want instead