It can change your perspective, seeing your car from the point of view of an "outsider". The last time I re-made my former '59 Chey pickup, I took it to a shop in Huntington Beach to get the Q-Jet blueprinted, and the engine fine tuned. I left it there - they told me it would take about two hours - and went for a walk, got some lunch, and was on my way back tot he shop when I heard a pretty healthy sounding engine revving and tires squealing. I looked up the street, and here comes my truck, rear tires smokin', and the front end pointing more towards the sky than the ground; he caught second, and it din't even bobble, just kept on storming down the street. I think my chin was hanging to my knees; and I was absolutely thrilled. I watched as he turned the corner and motored very smartly off down the street, impressed as I could be.