4” Dpf Back Exhaust for Toyota LandCruiser JMACX Converted 79 SeriesJmacx Converted 79 Series 4 Dpf Back Exhaust. If you are looking to improve the sound and appearance of your Jmacx converted 79 Series, but retain the DPF, our 4 DPF Back exhaust is a great option. Flaring to 4 right at the back of the DPF, our system will improve flow in the rear section of the system and make your 79 series sound great. With the DPF in line, there is little need for a muffler in this system. There is no muffler option available for