I ordered this Y-pipe for my 1990 Chevy C1500 with a 5.7" engine and 3" exhaust and it fits Perfect! The threaded hole for the O2 sensor that fits this Y-pipe is on the passenger side. However, the 02 sensor on my truck is on the driver's side and mounts directly to the exhaust manifold, so I just put a screw in the sensor. Mounting hole located on the Y-tube. I can't say that installing this Y-pipe was easy, but I haven't seen ANY Y-pipe yet. better than the original equipment and I seriously doubt I'll ever have to replace them again. I am very satisfied with this product.
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