[Perfectlap]

ahh a show car. That's the best kind to get. Lots of upgrades, zero track time.
I have this same car on my desk in Orange. It's a 1/18 model that came with a TechArt kit consisting of GT3 seats, TA wheels, aero, etc. Picked it up on Ebay for $50.

I might change the calipers back to red. For some reason to me they blend in more and I don't have to say deal with "are they ceramics?" questions.
Going back to stock suspension is definitely a good idea if raising the ride height doesn't cure the harshness. All that rattling and shaking is not good for a daily driver, things come loose, wear out quicker and I don't think it looks right on a GT.

I see a new set of wheels in your future....