Not to knock you personally Chuck but I hear people say this about dynos and flow benches all the time and I wonder why its being said-should we just **** can them all?.They should be recognized for what they are,tools,and extremely valuable tools that save a ton of time and expense and set the benchmark for a desired level of performance.Im not agaisnt tti but the facts are the facts and when you look at the engine masters challenge there are alot of good info about race car headers heres one example.I guess its an age old argument but the really fast guys around here all have had some time with a flow bench and a dyno.http://racingarticles.com/article_racing-72.html