DIESELR 6.6L GM Duramax LLY All In One Kit (2004.5-2005)

DIESELR 6.6L GM Duramax LLY All In One Kit (2004.5-2005)

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$1,741.34
$1,741.34
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DIESELR Duramax LLY 6.6L All-In-One Tuning Kit (2004.5–2005)

All-In-One LLY 6.6L Duramax Kit for 2004.5–2005: Full Tuning & Exhaust Solution

The DIESELR 6.6L GM Duramax LLY All-In-One Kit (2004.5–2005) is engineered for GM 2500/3500 trucks equipped with the 6.6L Duramax LLY. Designed for owners who demand real performance, this kit delivers full tuning control, exhaust upgrades, and the essential components needed for efficient power and drivability.

What’s Included in the LLY All-In-One Delete Kit:

  • EFI Live AutoCal V3 - BLANK – Industry-trusted OBDII tuning tool ready for DIESELR tune file delivery
  • EFI Live Tune Pack – DIESELR custom tune files for the LLY platform; choose Single or SOTF
  • 5 Position Switch – Enables shift-on-the-fly functionality with DIESELR SOTF tuning
  • DIESELR EGR Upgrade Kit w/ Intake Pipe – Improves flow and resolves factory EGR limitations
  • DIESELR Downpipe Back Exhaust – T409 stainless steel in 4" or 5" variants for high-performance airflow

Available Kit Variants:

  • Year: 2004.5–2005
  • Exhaust Size: 4" or 5"
  • Tune Type: Single or SOTF
  • EGR Kit: Included

Exhaust System Specs – DIESELR LLY Kit:

  • Built from 16-gauge T409 stainless steel for durability and rust resistance
  • Mandrel-bent pipes with upgraded flanges for optimized flow
  • Includes TorcTite® clamps and hangers for quick, secure installation

Why This 2004.5–2005 Duramax LLY All-In-One Kit Works:

  • Built specifically for the 6.6L LLY engine platform
  • Delivers precise calibration with DIESELR EFI Live tuning
  • SOTF (Switch-On-The-Fly) tuning for dynamic performance
  • Exhaust and EGR upgrades improve throttle response and reduce EGTs

Fitment:

  • Fits 2004.5–2005 GM Silverado/Sierra 2500/3500 HD models with 6.6L Duramax LLY
  • Not compatible with Cab & Chassis models
  • For off-road/competition use only

Installation Notes:

  • Requires Windows laptop and internet connection for tune flashing
  • SOTF switch only applicable when SOTF tuning is selected
  • Remote support available via the DIESELR and GDP tuning network
DIESELR 6.6L GM Duramax LLY All In One Kit (2004.5-2005)

$1,741.34

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Yes, most products we sell are backed by the manufacture's warranty. Warranty coverage varies by brand, so check the product listing or contact us if you have any questions before purchasing.

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If you're not completely satisfied, we're here to help. Eligible unused items may be returned within 30 days of delivery, subject to our return policy and applicable restocking fees.

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We process most orders within 1-2 business days. Shipping times vary by product availability and location, but most customers receive their orders within 3-7 business days after they ship.

What's the returns policy?

Returns must be requested within 30 days of purchase, Items must be new, unused, and in their original packaging. Approved returns are subject to a 30% restocking fee. Custom order, electrical, and special order items may not be eligible for return.

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