Magnaflow 18980 4" Downpipe Back Exhaust No Muffler | 01-10 GM 6.6L Duramax

Magnaflow 18980 4" Downpipe Back Exhaust No Muffler | 01-10 GM 6.6L Duramax




  • 4" Downpipe back System
  • No Muffler, Straight Pipe
  • Aluminized Steel
  • Single Side Exit
  • 07.5-10 (LMM) trucks Require Race Tuning
  • Fits 01-10 GM 6.6L Duramax

  • Magnaflow 4x5x13 Polished Tip - +$127.43
  • Magnaflow 4x5x13 Black Tip - +$143.13
  • Polished 4x6x15" Tip  DFT-BQ9-405015RSL - +$56.00
  • Black 4x6x15" Tip - +$56.00
  • MBRP 4x5x12" Polished Tip - +$54.99
  • MBRP 4x5x12" Black Tip - +$69.99


The Aluminized Custom Builder Pipe Kit Series has a limited 1 year warranty and offers the most options for customization. For the Racer, it provides a mandrel bent pipe-only exhaust from Turbo to tailpipe complete with all hardware. For the street driver, the CBPK is the basis for a custom exhaust that allows you to purchase and install the converter, muffler and tip of your choice.

Note: Box says for 01-07 Duramax, however exhaust will fit 07-10 LMM Duramax trucks.  There will be a hanger at the the transmission that will not line up, but is no longer needed due to weight reduction with removing the DPF/DOC


  • Series Ranks
    • 5
  • Color/Finish
    • Aluminized
  • Exhaust Inlet Connection
    • Clamp – On
  • Exhaust Pipe Material
    • Aluminized
  • Sound Level
    • Moderate
  • Exit Location
    • Single Passanger Side Rear
  • Exit Quantity
    • One
  • Warranty
    • 1 Year Limited


4 Item(s)

per page
  • Over All Rating

    By Benji Hyman on 10/19/2016

    Sounds just like I wanted it to loud and clear

  • Over All Rating

    By Bocephus on 10/5/2016

    The cut points were spot on, got it put on in 2 hours with a reciprocating saw and a socket set. Very good product for the price. A++

  • Over All Rating

    By Tyler Wormus on 10/5/2016

    This 5" Magnaflow exhaust sounds amazing on my 05 Duramax. Thanks Alligator for the excellent customer service! Couldn't believe I received the exhaust next day with free shipping.

  • Over All Rating

    By JOE SOLTIS on 10/5/2016

    Ordered this Sunday night and got it Wednesday! Thanks guys!!

4 Item(s)

per page