Let me tell you about the mods!
I used H&R springs, the drop it 1.2 inches at the front and 1.1 inches at the rear. The are stiffer than stock springs, but they are not too stiff. In my view they are what the stock car should have had. They don't cause any noticeable decrease in ride quality, but they do improve the car's handling quite a bit.
We went with Eibach Front and Rear Anti Sway bars. At Eurocompulsion we stock three different brands, and I have to say this was a tough call, as they all seem quite good. In the end I went with the Eibach bars for my personal car because they are a little easier to install, they look great (RED bars on a red car), have no welds to fail, and were the low cost option. I am going to say that for serious racing events at the track or autocross, I think the Progress bars we carry would be a better choice. The Progress front bar has three levels of adjustment and on the stiffest setting would be stiffer than the stiffer of the two settings on the Eibach front bar. That said, I am not using the stiffest setting anyway, so for a street car, at least for me that advantage is lost.
I really can't say one bar is better than the other. Again, for a track car, I would have put on the Progress bars, but for a street car, I like the Eibachs. Oh, and the rear bars from Progress and Eibach are essentially identical, it's the fronts that are different.
https://shopeurocompulsion.net/coll...ension/products/h-r-lowering-springs-fiat-124
https://shopeurocompulsion.net/coll...oducts/eibach-front-rear-swaybar-kit-fiat-124
Greg