Hello everyone,

So I recently installed the megan racing headers for my 07 civic EX. I like the noise and all, but I believe I havea backfire problem. When shifting above 3k rpm or down shifting, you hear the backfire noise pop. I am trying to figure out if it is bad for the motor? If I am accelerating in first hear and let go, I hear like popping every second until the RPM drops to about 2300.

So I am trying to figure out if it is bad for my motor, and if I can get something to prevent it, or check if possible.

It's a 07 Civic EX
mods:
Megan racing headers
DC sports catback system
k&n short ram

 

have you reset the ecu since installing it? is there a cel?

 

Yes, the ECU has been resetted, and there is a CEL on

 

well, the fact that it is a racing header means you no longer have a catalytic converter, so any unburnt fuel is igniting at the end of your exhuast when it hits the oxygenated air. if you havent tuned it, perhaps you are running a bit rich for the new race header

 

+1

 

some companies label headers that they sell with high-flow cats as "race headers."

 

 

mm i used to love backfires when i had my rx7 lol