hi, i have a 98 civic ex coupe, i just got an apexi sport cat back, but how come the sound seems to be louder than before, when i just had an aftermarket muffler?

thanks you!!!

 

more air flow plus the design of the muffler

 

also, am i suppose to hear the air flow when i give more gas?

 

could there be leaks?

 

Check your flanges and gaskets.

 

where is that located?

 

i also have an aem cold air intake install too, could that air flow sound from the intake?

 

The flanges are where the sections of exhaust piping bolt together, and where it bolts to your cat. The gaskets go between the flanges to seal them. Make sure all your flanges are tightened down, and there are no gaps in between them. Yes, your intake will make a whistling sound when you open the throttle, which may be confused with an exhaust leak.

 

cause before when i just had my muffler install, i never heard that sound, but now i can hear the whistling sound when i give more gas!!

 

i have the same noise it is normal...bigger pipe let's more air out so it is louder. the cai gotta make some noise i know mine does.