Racing Cam BROADFOOT FOR 944na????

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Hi guys like you see I'm being adding thisng to my 944na 1987//i called yesterday to boadfoot racing company , and they told me taht buy a racing cam form them , and put in my 944na, ?my question is somebody know how it will works?and if i add cam i will have to cange ecu unit or not or add a special chip ?o this will just work with all my stock parts ?will damge my engine with the pass of time ? how many hp can i spect to gain with this mode ? you guys recommend it??please i will apreciated a honest commment?technical reply Alina