No offense, but it's probably because it isn't a fast motor. I used to have a 1.5L civic with an intake, and it did the same as you're saying. It took forever to get faster, but you could hear all the air coming in. Those motors stock just arent made for fast rpms.




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We put the NGK's in it gapped at .44 and it seemed to gain some power back but still has that power loss after 1/2 TB.
