13.8bhp i think they've got the decimal point in the wrong place , lol , more like 1.38bhp
They're not exactly going to say that you gain little or no power or they wouldn't sell it . I phoned k+n the other week about a problem i had after fitting the apollo and spoke to the guy on research and developement who actually sorted the apollo out for the 182 , he claimed they saw a 10bhp improvement but tbh i can't feel any difference and i would say that the 5k isn't as pronounced as with the standard airbox plus my mpg's gone a little worse if anything.
Imo its ugly and a bit diy looking and fcukin expensive .