HI, newbie here. I have been reading a few hours now about moding. I was looking at mod chips than after learning more about fliptops was convince on that since I was hesitant to solder. But after realizing I have a PS2 Ver.4 game and that a solderless mod can be put in, I am now undecided again. Please help me on this. With the flip tops most recommend making sure have "memory doors and white disc" Explain what these are please. I know its lot to ask but can you give me the pros and cons to both fliptops and solderless chip if possible. also best place to purchase online. . Hope this helps others with same question. Thanks again to all whom contribute and god bless all especially our troops overseas.