im sure every little helps carl.
my take on the lighter pulleys etc, is that if they are lighter it will take less power to turn them, potentially freeing up [ower to be used elsewhere. are they expensive though is the question, seems like more of a garnishing mod.
the tube kits you see there just replace all the hoses in the engine bay. just a case of replacing the pipes like for like. shouldnt be to hard. Oem clips are a pain in the ass if you havent got the right tool, but pliers still do the job, just more awkwardly.