i own a 2003 g35 sedan and the service engine soon light just came on today but the only thing the car is doing differently is it sounds like the coupe like i have dual exhaust does anyone know what my problem might be

 

You probaly have a hole or a leak in your exhaust

 

Exhaust leak before the downstream O2 sensor.

 

Go to autozone and ask to use their code reader. Hook it up and get the code and that will help narrow it down

 

just got back from cnadian tire got oil change and found out there is a exhaust leak right at the flange at the back just behind the muffler so could that be it like i ripped it home it sounds amazing and still has all the power in the world without any problems at all but that dam check engine light is still on

 

He should be right because the o2 sensor may cause your light to go on. If you dont fix it, it will just get worse and the sound will be more annoying

 

lol got the ODBII reader lol hehehehehe sorry guys loose gas cap **** i feel stupid but releaved at the same time plus since oil change its picked up some horse again i use quacker state horsepower full synthetic its the **** i swear i picked up at least5 horse wen i first switched huge difference

 

I dont think you will feel much difference with 5 extra HP, its all in your head.

 

Lol, it's in your head for sure

 

lol no im serious there is a good difference and 5 horse is noticeable u notice the horse difference in a CAI and ur lucky if u gain 6HP outta that

so ya its not in my head so keep ur ignorant comments to URSELF