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Posted

Ok so I got my exhaust done today did a 3in piping from the cats back with an x-pipeand two Borla XR1's and had the third cat removed. Drove the truck about 3-5 miles back to my house and my check engine light came on. I hooked up my scanner and it shows DTC code P0420-Catalyst System Efficiency below Threshold(bank 1). Ive read that the third cat really is more of a dummy cat but im not sure if this is why my light came on. Anyone experience this before or have some info on it?

  • Like 1
Posted

How close did they cut to the o2 sensors? Did they weld there or clamp? Leak maybe?

Posted

The third cat is downstream of those O2 sensors so what it does or doesn't do is not monitored. Sounds like you screwed up an oxygen sensor.

 

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Posted

They cut pretty close to the o2 sensors and i took it back today to check for any leaks which i didnt hear and neither did they. They re welded around it and i cleared the code and it came back up so im thinking o2 sensor mightve gone out.

Posted

Removed the flowmaster and installed a spintech pro street 6000 3" center in 3" offset out and ran a 3" pipe after to a black 3" in to 4" tip. Sounds way better on my v6 and no drone. 6195db0de51dbc45f6ba222dcafbd3f8.jpgc80d81304d34e55c731e244a1fe0bf3f.jpg

 

2014 Silverado 2WT CC Summit White 4.3L V6

DROPKICK Edition

IG: jorge_dropkick_rangel

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Posted

Good GOD ok...

 

Volant exhaust with headers with no cats is FREKIN LOUD!!!

 

Going to see about getting a different muffler because jesus.....

 

Also got it tuned with my local tuner. BBP was iffy about turning my CELs off due to no cats so didnt even bother. Am super happy with the tune....

 

But god that exhaust...... My girlfriend said she heard me coming 3 blocks away..... Hahaha that's a bit too loud.

 

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Posted

Haha please get a video of that!

I have a cold start video with just the catback on my go pro.... Ill start it up in the morning with the headers and wake up 3/4 of the city hahaha.... Ill get a video posted up....

 

Cruising and idle it sounds beautiful but acceleration dear baby jesus cover thy ears cause imma commin!!!!

 

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Posted

Maybe try the 22" Magnaflow to quiet it down some. My 18" sounds good but would likely be too loud with headers.

Posted

Maybe try the 22" Magnaflow to quiet it down some. My 18" sounds good but would likely be too loud with headers.

 

 

that is the plan on Monday we also ordered a bullet style to use as a resonator.

Haha please get a video of that!

 

 

here is the video...

 

Yes it did scare me when I started it with the headers ....I had not heard it cold start yet so I wasn't expecting that

 

 

  • Like 1
Posted

 

 

that is the plan on Monday we also ordered a bullet style to use as a resonator.

 

 

here is the video...

 

Yes it did scare me when I started it with the headers ....I had not heard it cold start yet so I wasn't expecting that

 

 

 

Sounds like a vette with those headers on there.

Posted

 

Sounds like a vette with those headers on there.

Not in person.... Sounds like open headers haha it's loud as shit.... So will deff be looking fwd to redoing it on Monday lol

 

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