I have a 1994 3.4L with a K&N cold air intake and a generic flowmaster muffler..it sounds decent whenever I am idling but whenever I rev it, it pops on the way down...How would I go about stopping the popping noises?

 

get a Z that just the way the V6s are mine does it too i kinda like it tho

 

usually popping on the deceleration means your running rich, its the unburned fuel in the exhaust igniting.

 

i was thinking in my case its the 3 inch pipes

 

ya it does burn rich and someone said I should get the O2 sensors checked out how much would it cost to replace the O2 sensors??

 

autozone has some bosch sensors for like 20$ each

 

The O2 sensors are not going to stop the popping. There is better back pressure in your exhaust and it may just be that you are running rich....

Since I have put the magnaflow cat-back on my car, its pops when I rev and when I down shift to slow down. Sometimes so loud, it is as loud as a fatman's belly clap when he jumps....

 

this made me lol...im thinking of putting headers-back exhaust on mine..but how do i figure out if i even need to change the o2 sensors?? cuz i no im most likely running rich...but is that the only thing that causes running rich?

 

if your o2 sensors are bad it would shoot you a trouble code.

 

^^^ not always, bad iat sensor, bad info from temp sensor, stuck injector will also cause rich af mixture.