ok so i got a noticeable amount of power loss at high rpm. during this power loss i get a sound like a stock civic is at redline next to my car. (my exhaust is perty loud so its kinda hard to hear) also seems like i have to put more gas to get moveing from 1st gear...
i had a problem like this before and my local rotary guy replaced the starter and battery with some better stuff... he did check the compression and said everything was ok after he worked on it... (just trying to give you guys some backround)
the spark plugs have like 3000 miles on em along with new coils and wires.
i dont have a cat so its not a clogged cat haha.

list of relevant mods: rb intake. obx header. custom mid pipe to rb exhaust. zex nitrous... these problems kinda seemed to happen out of the blue so i have a hard time thinking any of my mods caused it...
and with all this stuff on the car going to the dealer isnt really an option...
any ideas you guys can come up with i would really appreciate...