K10 Standard performance upgrades

Hi lads, it's all in the title really! I'm just after a bit of advice/know how about what standard mods I can do to my k10 engine to make it that little bit quicker without spending that much money? I know it sounds like i'm being tight but bills and more bills leave me with limited cash to mess with my automobile. I've done the stuff like replaced the plugs, oil and filters I was just wondering, what else is there?
 
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