sneakypete

If you tune a car with an open dp or e-cutout will you get a check engine light if the o2 sensor is after the cutout? I have an e-cutout (summitracing one)with my o2 sensor about 3-4 inches past the cutout. With the e-cutout open the exhaust gas will still pass by the o2 senor but not nearly as much if the cutout was closed, will the ecu through the o2 code?