I didnt realize u were taking offroad so your way off. Far as the books software data, I can help u better come to my track which I been testing cars for 15 years at the same place and since I am the fastest there and most consistent my data is accurate and it's a track designed for mostly bottom end, and I will show you pipe after pipe and manifold after manifold the results and it will prove how a shorter manifold and a bottom end track will result in faster lap times and yes using a radar gun to show top speed difference. Because at the end of the day all the books in the world dont matter when what we are ultimately trying to achieve is faster Lap times. Thanks for your inquirie into my knowledge. Think u had too many beers !! Lol