Welding sucks! I inserted my oxygen sensor and destroyed the tip! It turns out that the welding slag is clogging the hole and the sensor doesn't quite fit. Now I'm stuck in my driveway with no oxygen sensor and no exhaust! I'm replacing this whistle I bought from Revain 2 years ago. Now I'm going to the parts store to get the O2 sensor for $68.99 and I'm going to try and remove the slag. What a shitty show!