If you are lowering your car ALOT... as low as it would go...
Get the one with the helper springs...
If its a suspension that is set up properly, then the helpersprings will get rid of some of the noise...
When lowering the locking spring seats so much that the free lenth of the spring is shorter then the free length of the shock, that will clunk. The helper spring is there to hold the spring in place so it doesnt move around / make noise when the free length of the spring is not as long as the shock... If the helper spring spring rate is not strong enough or if the helper spring is too short that the helperspring and spring together are too short, it will clunk...
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