I've had the FlexaForms on my T/A since ~1990... used primarily for SCCA Solo II autocross in class E/Street Prepared (nationally-prepared for ultimate competition!). I discussed with FlexaForm and determined a spec of 225# w/5"arch so the springs would be nearly flat while at rest in competition condition (~1/4 tank fuel with driver ~175#). I pulled the rubber bushings and installed poly bushings (had to slightly turn down the fronts to fit). The springs do take a while (~1-2 weeks) to "settle" down and be flat (otherwise, they are arched for a while and allow wheel-hop until they are settled). I'm very pleased... improved handling through more weight reduction overall (I think they saved ~20# per side). My overall strategy has been to reduce weight of the car (total down to ~3150 today).