I used to be more organized. I kept service records, receipts and notes on almost everything. Now? Not so much. I do keep downloaded tech articles. Magazine reprints. catalogs to retain part numbers and various tech tips. A buddy of mine that is otherwise a convoluted mess, has a binder with almost every modification he has done well drawn and detailed to his Challenger. I do have notebooks with handwritten text. I've written about every nut, bolt or screw that I have touched. Engine builds, tuning, brakes, suspension... everything. This helps keep me from trying stuff that didn't work before. It also serves as a blueprint as to what actually has worked in the past. What about you guys/gals ?