It's been just over a week since Nissan revealed the Z Proto, expected to be called the 400Z, which previews the Nissan 370Z's replacement. While excitement for the Z Proto was high, not everyone has been bowled over by the styling. It's not that the Z Proto is ugly, it's more that it isn't quite as impactful as expected.

However, the clean and fairly simple lines seem to be the perfect foundation for a series of more adventurous iterations, such as this 400Z Nismo. Two more artists on Instagram have created more extreme versions of the 400Z and they both make quite a statement.

The first set of renderings, shared by yasiddesign, is a two-tone gold/grey 400Z with a lengthened front bumper, a longer hood, and reshaped headlights. Along with bigger wheels, massive fender flares, and rearview mirrors which have been positioned on the fenders as a throwback to the original 240Z, it appears far more menacing than the Z Proto.

At the back, there is a swathe of carbon-fiber beneath and between the taillight clusters, bigger dual tailpipes, and a large spoiler. The louvered rear window is another big change.

Also showing off a more aggressive take on the Z Proto was flathat3d, with this design being inspired by the Pandem A90 body kit that has been seen on the Toyota GR Supra.

Finished in what looks like matte silver paint, this Z Car sits incredibly low to the ground and has exaggerated side skirts, fender flares, and a powerful bulge on the hood, among numerous other tweaks. It looks like the car that the Z Proto should have been all along, but remember, the production version of the 400Z could end up looking more aggressive after all.

Even if the Z Proto's design doesn't change much, the basics are in place for aftermarket tuners to add their own visual upgrades and emerge with a much more audacious version of Nissan's Z car.