SDP 04.5-05 LLY Duramax Compound Kit

SDP 04.5–05 LLY Compound (Twin) Turbo Kit

Cannot ship to California addresses.

PLEASE NOTE: These kits are built to order with a current lead time of 4-6 months. We regularly have other kits available for immediate shipment or sooner lead times, so please reach out before ordering if you need something quicker.

The SDP LLY compound kit is built for trucks that need big power with strong drivability and clean fitment. This setup is designed around high quality fabrication, leak-free connections, and coatings that hold up to heat and boost.

Kit Features

• Includes SDP 3" high-flow Y-bridge kit

• Fully TIG welded for smooth joints with flush internal tubing

• Custom high-flow 3.5" mouthpiece with O-ring seal to prevent boost leaks at the factory turbo connection

• V-banded crossover pipe on the S400 outlet + stock turbo mouthpiece
  (no more weak factory worm gear clamp)

• Includes valve cover vent fittings with hose and tee
  

• Radiused T6 exhaust flange with unique mounting setup for easier installation

• CNC machined turbine outlet flange designed to slip-fit inside the factory exhaust housing outlet for a tight V-band seal

• High quality stainless steel V-band clamps and T-bolt clamps used throughout

• Hot side piping + exhaust housing are ceramic coated and heat wrapped

• Cold side piping + compressor housing are powder coated (color of choice)

IMPORTANT NOTES

• MAF rescaling and tuning are required for the larger turbo

• Race use only

• Due to the custom nature of this product, all sales are final

Lead Time & Order Policy (READ)

Current lead time for fabricated and powder coated parts is typically 40–60 business days from order date until shipment, but lead times can vary due to supplier/material delays outside of our control.

By purchasing this product, you agree to possible delays. Once the order is in process, cancellations may be subject to a cancellation fee, and refunds may not be available.