quality seems to be slipping
I have a few sets of these, and this last set does not measure up to the others. Looking inside the collectors, one side is clean with nice round tubing ends, while on the other side, the tubing is crimped, and bent and poorly done. I had to run a 18mm x 1.5mm tap thru the O2 sensor bung to get it to thread in. I also bought the mid pipe for this application, and it did not come with a plug for the sensor if not used, and also needed a tap run thru it before a sensor would even start.