H pipe problems

[sdmjr]

I put a bbk OFF ROAD H pipe on my 90 gt, now the CEL is on. Do I need an extender or did I break something ? Any help or suggestions wouls be great.
thanks

 

[BlownFiveLiter]

A check engine light after an H-pipe swap typically makes one think something related to the O2 sensors, if that's the only thing that was touched. It could be as simple as one of the sensors didn't plug back in completely, or one of the wires in the harness has a short. Pull codes and see what's causing the CEL.