Exhaust removal

[KrystyonWayne]

I have a 2016 Crew cab sierra and I am wanting to run straight exhaust from each cat and exit in front of the rear tires.

 

Does the range afm module have any issues? I have been looking and reading reviews and decided to go with this until I have parts needed to remove afm from truck completely.

 

Besides being loud is there any other issues with running straight from the cats?

 

Factory is 2.75 from me measuring so I should go with 2.75 or go to the 3" all the way?

 

 

[KrystyonWayne]

Should I use an X-Pipe or H-Pipe? Does it matter?

[Logan Lanfear]

Chances are, you're might loose power and only gain sound.  Using an X pipe would help, they're harder to make compared to an H pipe.  Not sure how the computer would work, as long as youre not cutting out any 02 sensors...

[KrystyonWayne]

Will not mess with the O2 sensors they will stay where they are. I will cut before the 3rd cat and right where the stock y pipe starts to bend driver side exhaust over to passenger. As far as I am aware of everything from they stock 2 forward cats has to remain in place and the 3rd cat on can be removed without any adverse effects. 

 

I removed the everything from the muffler back yesterday and I like the sound of it. I may just run straight back and kick out side from where I am at right now and call it good for the time being.

[drentlaw1]

I ran open Kooks LT headers no cats, no y pipe for about a week no problem other that almost unbearably loud haha. Now I have catless y into Corsa sport and it's still way loud. I tuned out the rear 02s using Blackbear custom tuning and plugged the bungs.