the toda header has made the most gains on the dyno according to a recent header test i was checking out, I think they compared it with the hytech, smsp, dc sports, jdm 4-1 and a bunch others. It's prolly the best out there from what i hear, also are u familiar with spoon engines? Are you gettin a red top or yellow top spoon motor. I believe the red tops are stock honda motors with all internals balanced and blueprinted, I heard the yellow tops are fully built using spoon internals. I'm interested in hearing your plans so keep us posted. Thanks