Check this link
http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=124133&M=603%2E960&GA=722%2E317357&CT=M&cat=503&SID=07&SGR=045&SGN=01
it only works with IE
Part number 23 is Pump Element
With stock pump you dont get much over 200hp
IP needs some internal modification, and bigger elements. There is no need to change injectors. Best way to have good ip is sending it to finland.
It will cost nearly 1000€. They made some pumps to Us and sweden.
Stock IP have to send here in finland. Yes i know it aint cheap.