For those of you that wish to further advance your knowledge of a race engine, and have questions regarding the best/cheapest way to advance that knowledge, I highly recommend the book entitled "Stock Car Racing- Engine Technology". ISBN 978-1-55788-506-7 . Published by HPBooks, www.penguin.com . The book, in conjunction with PipeMax software, www.maxracesoftware.com ,for tuning/dimensioning the exhaust system in conjunction with induction dimensions, is likely the best $$$ you'll ever spend on your race engine. -Dave-