1989-1993 Cummins 4" Turbo Back Exhaust - No Muffler (412120)

The 411113 / 412120 by Flo-Pro is a 4"" Turbo-Back Exhaust System - No Muffler for the 1989-1993 5.9L Cummins. It allows you to drop out your restrictive OE exhaust system and replace it with a high-flow exhaust with a performance muffler. Just like all of Flo-Pro Manufacturings Exhaust kits, it will come with all the required clamps, pre-weld contour bent hangers, and stronger flanges to help you sail through the installation process. This kit not only sounds great but will improve mileage, increase torque, and lower EGT's in your 5.9L.

Part Number: 411113 / 412120

• 4"" Turbo Back Exhaust
• Straight Pipe (No Muffler)
• Increased Torque & Fuel Mileage
• Aluminized Steel & Stainless Steel Options
• Fits Cab/Box Configurations: RC-EC/LB
• Single Rear Exit

Aluminized steel is the budget-friendly choice. It has a protective coating that holds up well, but once that coating wears it will eventually rust through, especially in salted winter climates. The stainless option is T409 stainless, an automotive-grade steel built to resist rot, and it will typically outlast the truck. T409 is not polished show-grade stainless, so light surface rust or discoloration can still show up over time. That is cosmetic only and won't affect performance or service life.

Don't see your question? Ask us anything about this product.

• ?

  Does this exhaust replace the stock down pipe with a 4 inch down pipe

  This will replace the entire exhaust system behind the turbo!

• ?

  Does this get rid of the stock down pipe

  Yes, everything from the turbo back!

• ?

  Just wondering if this fits a d250 club cap long box 1993

  Yes!