Is it worth upgrading the suspension for track use?

I've had my eye on a performance suspension upgrade for my Nissan GT-R, but I'm not sure if it's worth the cost. I primarily use my GT-R for track days and want to improve handling and lap times. Should I go for the upgrade or stick with the stock suspension?

In my experience, upgrading the suspension for track use is definitely worth it. The improved handling and stability will make a noticeable difference on the track.