Could cause issues with the DPF sensors as they sense a pressure differential across the filter. Sensing a higher pressure on the downstream side might freak out the regen computer.
2014 WK2 EcoDiesel Limited 4x4 Maximum Steel, ORAII, ATG, 8.4AN
1990 Mercedes-Benz 300D 2.5 Turbo - 155k
No sparks allowed!