https://youtu.be/5vZTXSZAmDw?si=RRwcT170X01ufiTD
Nismo Z vs manual Dark Horse vs manual Supra comparison video, primarily on the track.
Honestly pretty surprised at the dyno figures, and the track times show how formidable the Supra can be. Really a great deal.
I think you need a lot more than just stiffer shocks, you probably need coil overs.