I broke down and bought some AST 4150s and a whiteline front sway. The ASTs were just to enticing. lol The new ones are lighter, have a better sway end link mount, are upgrade-able to doubles, have new seals, pistons, top guides. Shit, it might as well be an all new coil-over.
Picture courtesy of Vorshlag
Plus the Grand Am Boss 302s run AST 5xxx series and I follow those races closely. If its good enough for Jack Roush Jr. #61 to race and win on, they're obviously more than good enough for me.
I had contemplated the Eibach R2s, but what it came down to for me was a final solution. The Eibach's would be good for what I use the car for now: DD and track day car. But will they be good enough when I start time trials or eventually move into some wheel to wheel stuff. The ASTs look to be future proof for me.
So far, I've been completely satisfied with my purchase through Vorshlag even though I haven't received them yet. They people I've talked to are friendly and knowledgeable and I know without a doubt that their customer service and expertise will be 100% reliable should I run into any issues in the future. I've been reading his blog for a long time; much longer than when it was on this forum. Terry's write-ups are without question some of the most informative and entertaining pieces I read on these cars as far as suspension. I can appreciate that he uses the stuff he sells and does pretty well with his car and the way its set up. Once I placed my order they actually went and quality control checked everything and put it together before packaging it up, something I'm sure a big company wouldn't do. I also had Matt call me because he forgot to mention something to me the day before and all the while both he and Jason called me by my name. I already felt like I knew these guys and I hadn't spent more than an hour and a half on the phone with them. So I think more than anything: their fancy pictures, write-ups, etc, their customer service really impressed me.
I should be receiving everything next week and I'll post my impressions here for you guys if you'd like me to, or I'll make a new thread. Should be a gigantic step up from my twin tube, compression adjustable D-specs with too soft BMR springs. I think I should be quite happy with 450/175 springs and a monotube nitrogen filled quality dampner. I won't be able to truly offer any indication of their performance till I go back to the track in February but I think I should see a pretty drastic step up even on the street. Who knows, the car might even ride BETTER.