Weird Exhaust Noise

[xrobbx03]

I have had the Apexi N1 cat back and downpipe for almost three years now. It has always had a nice low smooth sound to it.

Yesterday out of nowhere my exhausted started to sound different. It got a little lower but now with a bubbly noise to it. What would make this do this? Is it a sign that something else is wrong? Maybe a leak somewhere?

 

[flashburn02]

Well sometimes when a CAT goes bad you'll start hearing a bubbling or popping noise. If you wind it out to wide open throttle and you hear the popping again I would suggest a bad cat. Jack the car up and shake the exhaust near the cat, if you hear rattling you have lost a chunk of your honeycomb converter. Are you running rich?

 

[Chris66]

I have the same exhaust minus the downpipe and it's been doing the same thing ever since I put it on. It's the compression. Granted I'm talking about when you down shift which is when I assume it does it. If not then I don't know. All cars do it but you can hear it better with the exhaust.

 

[chico904]

Well sometimes when a CAT goes bad you'll start hearing a bubbling or popping noise. If you wind it out to wide open throttle and you hear the popping again I would suggest a bad cat. Jack the car up and shake the exhaust near the cat, if you hear rattling you have lost a chunk of your honeycomb converter. Are you running rich?

His downpipe probably got rid of the cat.

 

[xrobbx03]

His downpipe probably got rid of the cat.

originally i did have no cat because of the downpipe but i had problems passing emissions so there is a brand new high flow on there that I got back in november.

 

[chico904]

I'd check for exhaust leaks just to rule that out.

 

[xrobbx03]

if not exhaust leaks what else could it be?

 

[flashburn02]

I'd check for exhaust leaks just to rule that out.

Yeah a hole in the exhaust would definitely make it bubbly sounding.

 

[xrobbx03]

I will have to give it a good check this weekend then, and get it fixed if it is.