iv seen heaps of ea's and ebs goin around with body kits and iv got no idea where to go can someone tell me an idea of price range. and also wat little l0ow costly thing can i do to improve proformance

I have a body kit at home that I no longer need, Both front and rear skirts plus the side skirts, it is the half bumper type ie sits in the dividing grove on both front and back bar the kit is in very good condition only has a few scrapes but nothing majour.
cheers Paul