Heidt's, TCI and Fatman are all based off a suspension design from 30 years ago. The spindle is short, in most of the aftermarket mustang II kits there is no anti dive built into the suspension. The short length of the control arm also limits travel which mean you need a stiffer spring. Plus the camber gain is really fast due to short control arms. Plus they are just made withs maller tubing and therefore not as strong. There are alot of other popular suspensions that have gone by the ways side due what is currently avalible. The C4 corvette stuff, why would you ever run that stuff when the price of a replacement ball joint is more then a brand new control arm with ball joints and bushings and the A arm. The avaliblity of the brakes for the C6 out numbers the C4 10-1.
Technology has come a long ways in the past 10 years and you can see it in the products that are currently avalible on the market. The Mustang II design is like the Small Block chevy it still has its place but there are much better coices to made for the money.
Heidts may have some new products coming out that will set the world on it's ear, but they will ahve to be proven the days of having and old car that has updated suspension that drives like crap are over with, with as far as the bar has been raised in the past 10 years.
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