Header Wizard Calculator is an easy to use 4 stroke tuned header calculator wizard that also features tuned inlet lengths. It is primarily a header design program, and it does calculate the best performing header specís. The header dimensions are arrived at utilizing special wave tuning based on thousands of dyno dataís, latest science, and a very special simulation module. Also, it does tuned inlet calculations, that outperforms traditional formulaís, as all is done with very special wave simulations, not simple empirical formulas. Users input some basic engine information along with details about their cylinder heads and camshaft timing and it calculates optimum primary pipe diameters and primary tube lengths and collector specifications for optimum performance. The Software is now developed over a period of 15 years and many tuners gave rave feedback on the latest versions during beta and production testing, with many impressive results.