[Laguna Seca Blue]

Congratulations on your purchase! Yes, all catless downpipes will throw codes. Is your CEL on? If not, you're probably tuned or have a DP fix. Most likely you have a piggyback in your ECU compartment. The easiest way to check is to double tap the DTC button. If the CEL light flashes or the tachometer suddenly shifts positions, you have a PROcede. If you push down on the volume down and channel down buttons (I think) on your steering wheel at the same time and something similar happens, then you have a JB4.

It's very likely that the previous owner sold the tune separately, but its worth opening the ECu box to check and load the latest firmware and maps onto whichever tune you have (if any).