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Thanks Jon, This book seems to be everything he has done for 25 years all rolled up and adjusted to the latest technology of the last year or so. I'm about 1/2 way through but I can't find any aero mod you can do to a production car he doesn't cover in depth somewhere in the book. Yes, he emphasizes no aero modifications should be made unless you measure the effect. It may not be what you expect and may upset the aero somewhere else. I am trying to wrap my head around how much lift a car, any car, produces. So for a production body style, you are basically trying to reduce lift, not create downforce. Exception being major mods like splitters combined with diffusers and wings. And as expected, lift and drag are 2 completely different things. Air dams reduce drag, splitters increase downforce forward of front axle only which can really lighten up the rear axle due to the lever arm. One example on an air dam he tested a 4" deep and a 9" deep. The 4" reduced drag almost as much as the 9" and left greater ground clearance. He tests plenty of bolt on parts in the book and proves they work as intented. So obviously there are bolt on parts designed for specific cars that benefit lift or drag. But if you have to make choices or optimize the part, better be ready to test. Obviously a rear spoiler works on an early Z. But how tall and what angle is best to optimize?