If you want to truly future proof, get the SPL end links. Too many people talk about broken Z1 suspension components both on and off the track. That said, they have improved things, but I wouldn't trust them on the track still, seeing as suspension is one thing that keeps you from hitting the wall.
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I'll go the Hotchkiss route since a local friend that tracks extensively have used it with great balance on his 370Z for several years and transferred to his new Z, no issues to report! Good enough recommendation.
Most cars are designed to understeer from the factory as a safety design. Imagine a distracted mom with kids in the back of her van getting on the onramp and she hits a bump or gets 1 wheel off the road, its likely she may snap the steering wheel back. If there was an excessive amount of oversteer she would definitely lose control of the vehicle.
What 5thZ said is absolutely correct as far as average drivers are concerned. Most people are safer driving a car that understeers in an emergency situation. To understand understeer/ oversteer from a sports car performance driving perspective, (for those that don’t understand) think of setting up cones in a circle in a parking lot. You attempt to slowly increase in speed going round and round without upsetting the balance of the car (no abrupt movements). You’re just keeping the steering wheel pointed on target and keeping the car as planted as possible. You’re going faster and faster until something gives out. If the front end looses grip you’re forced to go wide and loose speed in order to get back on track. This is understeer. If the tail end starts loosing grip, it swings wide causing the car to point it’s nose in toward the corner and then with steering input and throttle control you can control the point of the front end and stay on target. At the limit of a car that just slightly oversteers you can actually steer the car with the throttle a bit. Hold more speed. (Not taking about hanging the ass out in a full drift)
. This is not about the balance of the car. This is too much throttle while still having the tires pointed towards the corner. It can also be caused by throttle lift while mid corner causing an abrupt weight transfer from rear/middle to the front end causing the rear to get light and loose traction. 
Great analogy.What 5thZ said is absolutely correct as far as average drivers are concerned. Most people are safer driving a car that understeers in an emergency situation. To understand understeer/ oversteer from a sports car performance driving perspective, (for those that don’t understand) think of setting up cones in a circle in a parking lot. You attempt to slowly increase in speed going round and round without upsetting the balance of the car (no abrupt movements). You’re just keeping the steering wheel pointed on target and keeping the car as planted as possible. You’re going faster and faster until something gives out. If the front end looses grip you’re forced to go wide and loose speed in order to get back on track. This is understeer. If the tail end starts loosing grip, it swings wide causing the car to point it’s nose in toward the corner and then with steering input and throttle control you can control the point of the front end and stay on target. At the limit of a car that just slightly oversteers you can actually steer the car with the throttle a bit. Hold more speed. (Not taking about hanging the ass out in a full drift)
Some talk about “snap oversteer”. This is caused by too much throttle spinning the rear tires and having the ass end swing around on you like an unhinged Mustang driver at a cars and coffee event. No one wants this.
Hope this helps. And if anyone has a better analogy please chime in.
Nice! That's what most people say even on lowest setting. What do you notice right off the bat?
