The AP1 suffers from a little bit of unpredictable “snappiness”, when driven at the limit. While it may make the car feel more lively on the street, this isn’t exactly the type of behavior that you want to have on the track.
One the of reasons for this is the motion ratio biased towards the rear wheels. The rear swaybar on the AP1 is extremely stiff at nearly 500lb. Some people swap in a miata front swaybar, which I believe is somewhere in the realm of 170lb. But I opted to go with a non-CR AP2 bar which falls around 320lb. I like a car that’s a little looser, so I think this bar will be a good choice for me. But we will find out.
The job was fairly straightforward, just unbolt everything that is connected to the swaybar, and everything that is in the way. Which includes disconnecting the catback exhaust and dismounting it from the rear hangers. Make sure to buy some silicone grease to lube up the hangers to make it easier to slip the bushings off of them.
Here you can see the difference in the size of the AP1 bar compared to the AP2 bar. Makes it look like a toothpick in comparison.
Also, you must make sure that there is weight on the rear wheels when you perform this installation. Otherwise you risk fastening the bar in a position that creates preload on the rear suspension. Which is bad.