...aerocharger has worked closely with doo engineers for years, with drone planes etc. and engineers are like most motorheads, they always love more power...this is why it is not necessary for doo to produce a turbo...anyone can purchase from a few companies and ride to their hearts content...Those sleds were all Calvin's and he has been riding aerocharger for 4 years. Brad is an awesome guy to chat too and he does not overstate his product...