Definately the fuel system stuff as mentioned above. Also you will want more than 5-7 psi. I tried that it sucked, 9-10psi sucks and at 12 i start liking it and 15 is great and shooting for 18 psi as soon as i get my sfmu. I would say get the sfmu and dont mess with the basic fmu cause youll want it sooner than you think. I got a TRE performance pump from ebay and its only loud when i first turn the key and it starts to pump, other than that i never hear it. Keep us updated on your build man