This book is a little dated, but it gave me my education early on. It helps you understand the purpose of most every popular modification and how they all work together to create a comprehensive car build for whatever your tastes may be (warning, includes spinner rim references):
[ame="http://www.amazon.com/Car-Hacks-Mods-For-Dummies/dp/0764571427"]Car Hacks & Mods For Dummies: David Vespremi: 9780764571428: Amazon.com: Books[/ame]
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Current: 2005 Porsche 911 Carrera S 6MT
Previous: 2 BRZ's, 997 C2S, C5 RS6, C4 S6, B8 S4, GDB STi, S30 240Z, FC3S RX-7 TII, AW11/SW20 MR2, E30 318is/325i, etc.