Oh is it a customs thing? And it's not that you'll need it for 5-550 but it's better to be over-prepped IMHO so the system isn't at near max capacity. Know what I mean? I believe they're the same price too. I remember [MENTION=2]Si Speed 317[/MENTION] mentioned something about his AEM pump that he wanted to change it to something else for power reasons.



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As for the bigger pump, nope! Works great actually. Installed one on my friends Si last year. Works great and makes me jealous as I didn't get it lmao. I'll get rid of mine when I need to, just a PITA to get back at it and swap. Honestly, it depends on who you ask. Ask 5 people, you'll get 5 different opinions. For what it's worth, I'd just do it once and never have to worry about it. That's my take on it.



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