The J-series engines were first introduced in 1996 and it was Honda’s 4th V6 family. The engine itself is a 60° V6 with features such as Variable Cylinder Management (VCM) system and VTEC. The most well-known engine in this family is the Honda J35 and it’s installed on several different Honda models.
Generally, this is roughly 3 to 5 feet behind your muffler and a foot behind your engine. *Note* Depending on your specific make and model, as well as the particular catalytic converter that you have installed, the location my vary by +/- a couple of feet.