Review on 🔧 Enhanced Exhaust Flange - Walker 31880 by Macaiah Arreola

This flange is not flat. He bowed. Line up the flat sides of two of them and you'll find daylight in the middle. The Walker 31388 gasket that joins the two surfaces does not solve this problem. I used these two brand new flanges along with a Walker 31388 gasket to try and hook up a general purpose catalytic converter to my rear catalytic converter as my main catalytic converter had failed. After all the work of bolting, tacking, stripping and welding seams, re-bolting, re-tacking etc to make sure everything fits together like it was an OEM catalog/manifold, I'm a happy tourist. I even cut off the flange on my secondary coil to make sure it will work when I'm done. During the first 30 minutes of normal driving my idle fuel trim on this bench was 0-4%, typically 0-1. %. Ideal! Suddenly the fuel trim jumps to 10% at idle. WTF?! "Perhaps the bolts connecting the two flanges have become loose." I check them. "No, they're still good and firm at 50 ft-lbs. Time to check the exhaust. I may have a small hole in one of my welds." Low and lo and behold, the smoke is coming out of where these two bent flanges fit together. Please note that this process was very time consuming. "Ok, I'll do that Use factory o-rings." The factory torque is 46 ft-lb where I placed these two flanges. Above 30 ft. lbs., the sides of the bolted flanges flex even more than they already do with the o-ring have done, not with the Walker 31388! What steel are those flanges made of? It's not as bad as a pan, but it's not as strong as a factory flange either.