ok cool, so 1 pump is all ill need. by 655 i assume you mean the swiftech mcp655 correct? i have done a bit of research on it and i came across a few forums that say a 355 with a modded top is actually better. im not sure how much better though. do you think a 655 wuold work well for what i need? and thank you for taking the time to help me out.