Yup...been there and done that...
Just throwing in my 2c here. I just purchased the Cusco front and rear bars. I haven't tried the front yet (doing research for that after reading the instructions in the FSM led me to this topic), but I have done the rear. Easy as a drink of iced tea. I'm not going to do the front until I have at least one Solo2 event with ONLY the rear changed, so I can measure the change. I think whichever you do, you should do both, to maintain balance. Stock, the 124 has great balance in a slide. A huge front -or- rear bar could send you into under or oversteer in a bad way. I'm creating an imbalance temporarily, on purpose, for the sake of testing, but I'll be putting in that front bar soon enough. Also, having seen the instructions for the Progress bars, I have to say, their attaching hardware looks more robust than the Cusco bars, with thick but narrow bushings and bushing brackets. Without having seen those PDFs until installing my Cusco rear bar, I decided to have some billet rear bushing brackets made, I'll be using my own polyurethane formula for making new bushings, and I'll be swapping to adjustable end links. I'll likely be doing the same thing with the front- I just know the car will be immobile for a few days while I'm doing that R&D for the front bar... and my wife is NOT going to do without he summer fun car for more than a day at a timeIm starting my research into Sway Bar upgrade, I was thinking of upgrading just the front. Progress Technology quotes the stock front at 102 lb/in and theirs at 300-385 lb/in. That sounds like a BIG change. Does anyone know the lb/in of the Eibach or Cusco bars? Will upgrading only the front imbalance the car and have a negative effect? Any help, tips, or first hand experience is appreciated.