That's laying under the car, passenger side, looking toward the front, next to the transmission. The pipe you see is your passenger side midpipe.
In general to find it, go under the car. It will be on the passenger side, tucked in near the engine, just above the K-member, between the bellhousing and the engine mount. You'll need a lot of extensions and swivels to get all the bolts. Remember to disconnect the battery first before servicing it.