Jay bought a dyno
Jay bought 150 freaking intakes
Jay bought probably 70 intake gaskets
Jay built 4 different engines to test all those intakes on
Jay published the book himself, so he could sell you a $38 book that probably took 5 years of his spare time and this book literally GIVES away every secret, every tidbit of information he learned swapping 150 intakes (plus a bunch of headers and exhaust manifolds, carb spacers, etc) onto 4 different engines and dyno testing each one so someone could come onto the forum that he himself funds and whines about the cost of the book.
have a nice day.