4.7 Exhaust Questions

[Ryanhoelzer]

I have a 2012 1500 with a little over 230,000 miles. I'm fairly certain one of the cats was clogged or clogging, would get catalyst efficiency codes, etc. I swapped sensors and the code stayed in the same place so pretty sure it wasn't the sensor.

I recently deleted the cats and replaced from the muffler back and am mostly happy with it except one issue. It has that high pitched bap bap bap noise sometimes, not always a specific RPM though, sometimes depends on engine load, etc.

Here's what I have now. 2.25 from manifold adapted to 2.5 filling the cat spot. O2 sensors connected to that section with spacers. Have had codes come back in but I can work on that with spacers or capacitor/resistor.

Original Y pipe and 3" back to muffler, Magnaflow XL with 3" input and dual 2.5" output back to the corners.

I'm thinking about adding resonators, they would have to be pretty close to the end of the pipe (which is where the factory one was).

Or putting cats back on it. Will the cats help with any of that noise or purely emissions?

Any thoughts or experience with similar? I'm looking for any increase in performance I can get, would like louder than stock but don't want obnoxious..

 

[jws123]

Just put it back to stock it is a 4.7 not to much you can do if you want real performance sell it and get a hemi.

 

[QwikKota]

I would not put cats back on unless you are showing error codes. The resonator should get rid of any crackle and popping or at least reduce it to be tolerable. You can cut out an existing section of pipe and clamp on a resonator to see if it works before paying to have someone weld it up.

 

[Ryanhoelzer]

I put some small (about 9") resonators on it and it's pretty good. I'll have to drive it some but I think it will work.

 

[Magnaflow]

We always advise running catalytic converter for emissions purposes and also for the sound benefits. They will eliminate the crackling and popping that you are experiencing.