Re: Polyurethane Suspension Bushes
Interesting info from Big Al. About 10 years ago, I supplied Superflex with a full set of suspension arms to use as a pattern for their 'sud and 33 parts (and got a couple of free sets of bushes in return).
I would say that for road use, Superflex do the job well and give a better ride quality. For track use, the standard Powerflex bushes are stiffer and probably better but transmit more road vibration.
Don't forget that Superflex have a variety of grades of polyurethane and if you want a very stiff set, they can make them for you.