I had a set of Hotchkis rear springs in stalled and it looks and drive great.
But the polymer bushings make a lot of noise. (squeak ) It get worse on colder days better on warmer days . ? OIL grease ear plugs our what.

Will they break in with time .
:confused:

You need to thoroughly coat the bushings in Energy Suspension Formula 5 Prelube, available for $5 at AutoZone and also available pretty much anywhere Energy Suspension is sold. I'm guessing they didn't bother to lube the poly or didn't coat them thoroughly.

http://static.summitracing.com/global/images/prod/large/ens-9-11110_w.jpg

If they were installed properly (lubed with the provided grease) in clean spring eyes you would have no squeaks or noise. Perhaps the shackles have been tightened too tight the urethane only squeaks when it's compressed too much or something causes it to bind.

The front sway bar bushings where it connects to the sub-frame are usually the noisy ones because the bushings are too tall before bolting up the bar...