Mid pipes (X-Pipe, H-Pipe, or Y-Pipe) come in two main varieties, those with and those without catalytic converters.
For mid-pipes that come with catalytic converters, a new or updated tune is not required in most cases, as this should allow for the car to operate without causing any Check Engine Lights.
For mid-pipes without catalytic converters (off-road), a new or updated tune can be done. With the tunes that Bama Performance offers though they do not disable any Check Engine Lights due to removing emissions systems like the catalytic converters or EGR systems.
**Be sure to check with your local authorities to verify what is & is not legal in your area.