Pawel- You didn't leave any way to contact you directly, and since you are not a member on the board I am not sure how you will get this... From what I can tell you really only have one official part # for the OEM fuel pump on the 1998 986 2.5L H6 engine...#996-620-102-00. You can source that specific part from just about any online site, such as
Paramount Auto. You may be able to find a better price, but at least this is an OE part with warranty. I can't locate the technical specs on the pump to tell you pressure and such, but I can tell you that this part is listed specific to that year and engine. I'll take a look in some other places to see if I can locate the technical specs specific to the pump, but for now that's all I can offer.