based on what ive searched about turbo choice youve probably bought one of the best all round turbo's for a zetec..quick spool and good power..this is only based on others experience . if i had the cash for a gt28 its what id have..good for about the 400bhp mark ..to add your 'ebay' gt30 wouldnt of been roller bearing..this if a gen garrett gt28 will be..spool up will be loads quicker