Review on Dorman 674-551 Exhaust Manifold with Built-in Catalytic Converter (Not CARB Compliant), Black by Robert Chandrasekar

The Dorman 674-551 exhaust manifold simply bolts directly to the engine head. My problem started when trying to hook up the exhaust pipe to a new catalytic converter. The right angle curve just below the new header/converter combination was different from the original equipment. The flange of the new catalytic converter did not match the original flange of the rest of the exhaust system. I had to remove the fixed bracket just below the engine to rotate the original flange to match the flange on the new converter. I was then able to insert 2 bolts into the flange yoke, although it was very difficult. When I tightened the two bolts, the two flanges connected and sealed the gas nozzle, but made a permanent connection to the exhaust system, causing the engine to vibrate at idle. I'm not sure what to do next. I think I should go to a muffler shop and ask them to lighten the binding, maybe by heating the area that flexes. Basically, the angle below can be 3-5 degrees from the position. Assuming the factory angle to be 90 degrees, this new collector/transducer combination is less than 90 degrees. I couldn't reinstall the hard hanger I removed to allow the installation. Conclusion: It works, but it's wrong. The woman is now complaining about the vibration. Vibration may be due to the rigid clamp not being installed. At least the engine is quiet now.