A couple weeks back I made my own rear anti-sway bar for the Mirage. So far it is working amazingly well. It completely transforms how the car handles. Previously, there was tons of body roll in corners, and taking them fast did not inspire confidence. This is a big complaint with the car by reviewers and owners alike. With the bar installed, it reduces body roll massively. It feels well planted in the corners. No handling machine / Miata mind you, but a huge difference from stock.
Here are some pics:
Here are the end pieces I made up.
Getting ready to install them on the spring perches.
All mounted up. SOME adjustment required with the huge slot.
The dang thing just wouldn't square up.
Tacked together.
Looks good to me. Not the prettiest, but its a prototype.
The next step was to remove it and finish weld.
I then prepped, primed, and painted the bar. Here are a few shots of it reinstalled. I did remedy the hardware length issue, though it did stay perfectly tight for about half a week until I got a warm enough day to swap out the bolts.