KBDP 3.5" Downpipe for a Duramax with S400 Turbo!

• For T4 S400 Single Turbos Running a 6" to 7.5" Pedestal.
• Eliminates the restrictive OEM factory flare joint
• Quick release 3.5" V-band clamp
• Removable 3.5" to 4" 90 degree exhaust adapter
• CNC Mandrel Bent from 409 stainless steel 3.5" tube
• 37" of Heavy Woven Heat Sock
• 2x -52 Hose Clamps
• LB7, LLY, LBZ and LMM engines require a drivers side transmission dipstick tube.

*Note: Fitment is extremely tight with a 3.5" downpipe.

Worn engine mounts may cause enough flexing for rubbing when accelerating. We will not respond to angry fitment emails if you choose to stuff a 3.5" downpipe on your stock daily driver.