If you are looking to improve the sound and appearance of your 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, though one can be added if you would prefer. All the components of this system are compatible with our turbo back system, except the DPF intermediate pipe, so should you want to change to a full system from the turbo back in the future, there is not a lot of redundant parts. Built from mandrel sections of 304 grade stainless steel and professionally tig welded, this system will last as long as your 79. Available in single and dual exit. Compatible with Airbags in the rear. Not compatible with coil converted vehicles. (Jmacx compatible system available for 79 Series). Select option for dual Exit for twit Exit DPF Back 4″ System. Supplied with additional mounting bracket, spacers and all items needed for a bolt in solution. This option is still compatible with Airbags helpers over the leaves.