2004 mazda 6s 3L Engine / Exhaust Suddenly Quiet & Lots of escaping air / gases

hotnoob

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2004 mazda 6s
Was accelerating a bit hard, and mid way through my car had a sudden loss in power and noise. the normal deep drone has been replaced with a not so loud mass air escape noise... but VERY noticeable. the car still accelerates fine, i'd say a 30-40% loss in power. engine sounds soso at idle; doesn't appear to be struggling - so, still a smooth idle.

the engine itself just sounds like someone turned the volume and bass knob down 80%.

normally my car is pretty damn loud has cold air intake and Y-Cat back 3"-3.5" came with the car when i bought it a year ago. bought it in the fall so i never had much of a chance to really get into it.

i am clueless as to where to start.

i have the following error codes:
P0403 - EGR Flow Curcuit Malfunction
P0300 - Random / Multipile Cylander misfire
P0174 - System Too Lean ( Bank 2)
P0171 - System Too Lean ( Bank 1)
P0403P

i had some codes before as well, i think the p0300 or p0403 is new; again the airflow stuff has been on my todo list.
lots of leaks in the exhaust also on my todo list.

ideas? where should i start looking? i'm pretty certain its a leak of some sort, but... never know.
 
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