I wouldn't gut the cat, imo. They are really expensive. And if someone knocks on them, they can tell that they are gutted. Who knows what the future has for us. I wanted to have a custom fake cat (look-alike) built, and then stamp it with the proper numbers, but no one has the equipment that I know to do such a job. So, I just had my 4" exhaust cut with a piece for swapping it in and out quickly.

After installing the sinister egr delete (i'm keeping my bulletproof egr cooler and up-pipe, i may need 'em some day), the truck was having issues at idle of low rpms. I also removed the throttle plate when I installed the banks intake/intercooler. SO I had eric at innovative diesel update my SCT X3 tunes with those parts deleted, and the truck runs much better.

Electronics can actually be your friend, if you can manipulate them to do what you want.

Has anyone passed the smog test with a straight pipe my truck doesn't have a Cat and I am trying to figure out if I can straight pipe my F-250 and still pass smog. Thanks.

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I am wondering if I straight pipe my 2001 F-250 7.3 will it pass smog, it doesn't have a cat so i'm wondering if i'll fail not having the muffler. Thanks.

If you have a 7.3L, they never came with a cat; you don't need it for Smog. You don't need a muffler for any truck, as far as I know.

If you have a 6.0L, YOU NEED A CAT, unless they "happen" to miss it in the inspection. I had a "good" smog shop perform my first check 2 years ago, and I had to come back after installing my cat.

Thank you :c:

Stab motorsports has a smog legal and lifetime warranty egr to fix all egr valve problems. Carbon proof