looking for some advice im looking at buying a focus 2.0 zetec esp and super charging it

ive found out the powerworks kit is no longer available apparently they only produce them for the ST's now
ive found a jackson racing kit available on ebay U.S

link: http://cgi.ebay.com/ebaymotors/FORD-...Q5fCarQ5fParts

how effective would using this kit be? and what else would i need to uprate? clutch pistons etc or would the oe parts be able to cope?

also whats a PCM reflash?