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Most HO cars come with rubber tires, some of which do not have the greatest grip. Switching to slip-on silicone tires will improve most cars. Silicone on sponge tires are better yet, but they are expensive, do not last forever and are not a huge improvment over silicone tires. Modern magnet cars require some maintainence. You should get replacement pickup shoes, guide pins and pinion gears for your cars. What you can do to get more power varies from brand to brand. With Tyco cars you can put in a "greenwire" armature and polymer traction magnets for a good boost in speed without spending a huge amount of money.