---
title: Top 3 mods for your LLY Duramax
description: "Improves spool-up and Increases Boost
Dramatically lowers EGT's
Eliminates most overheating problems
Improves mileage across the board
The most restrictive part of your 2004-2005 VIN '2' LLY Duramax intake is the factory plastic air horn. It connects directly to the factory turbocharger inlet and is proof that not all engineers are 'A' students. It's not uncommon to see 3-4 PSI of pressure drop across the factory piece. This pressure drop translates to about 10 psi of boost pressure at high load.Before you buy exhaust, before you buy an intake, buy this upgrade. Works with factory LLY style intake and aftermarket LLY style intakes.
Does not mate to LBZ intake piping.
Includes: LLY High Flow Inlet air horn
4\" Stainless Exhaust. Down-pipe back. 
4\" Stainless Exhaust. Down-pipe back.
Jack - SPADE - DSP5 Tuning - TCM Tuning - 2001-2010
Availability: In stock
Stock trans EFILive tuning 
The SPADE series (Standalone Programming And Diagnostic Equipment) makes the highest quality tunes on the market available in a simple to use OBD style flash tool. The tunes represent the best in drive-ability, reliability, and power. The SPADE system is the first hardware to ship pre-loaded with tunes of this caliber.  Requires no emailing, laptop usage or other tomfoolery. 
The SPADE has the ability to scan trouble codes and log data for analysis. The Jack SPADE is designed to maximize performance retain reliability on trucks equipped with a stock transmission.
Ships within 24 Hours of purchase with our proven DSP5 tuning:
Power Levels for 2001-2005  Trucks: 
1. Optimized Stock -Power delivery smoother than stock with near stock output -Refined timing tables for lower EGTs and higher efficiency
2. Heavy Tow Tune* +40rwhp over stock- Refined timing tables for lower EGTs- Throttle pedal revised for simplified low speed trailer maneuvering- Built for towing loads from 8000lbs to gross vehicle weight. 
3. Light Tow Tune*+60rwhp over stock -Refined timing tables for lower EGTs -Throttle pedal revised for simplified low speed trailer maneuvering -Built for towing loads under 8000lbs
4. Sport Econ +80rwhp over stock -Best balance of power reliability and efficiency for unloaded daily driving -Low smoke output -Throttle sensitivity increased for less throttle input, quicker shifting and less average RPM in daily driving situations
5. Stock Trans Race Tune -+100rwhp over stock –Maximum horsepower tune for stock transmission- If abused, has the potential to shorten the life of your stock transmission –Typically will run mid 14’s near 93 MPH on a truck setup for drag racing"
---

[Diesel Tuner's Blog ](https://blog.duramaxtuner.com/blog)

# [Top 3 mods for your LLY Duramax](https://blog.duramaxtuner.com/blog/top-3-mods-for-your-lly-duramax)

 Written by [Paul Wilson](https://blog.duramaxtuner.com/blog/author/paul-wilson) | Jan 11, 2016 2:30:00 PM

- The LLY Duramax  is a great truck from the factory for there are 3 modifications every owner should make! The LLY was manufactured 2004.5 and 2005. There are a few 2006 models that are labeled as an LLY, however they have all of the LBZ upgrades from the factory, so for performance applications consider those an LBZ. An LLY was the first Duramax with the injectors outside of the heads, a variable vane turbo and a 50 state EGR.

 However, they also have a restrictive mouthpiece in front of the turbo which can lead to reduced boost, fuel mileage, higher EGT’s, increased lag, and overall it just needs to be replaced. This is the very first place to start. Either install a LBZ Induction Kit, which is the full factory intake from the filter to the turbo. This will eliminate the LLY mouth piece and works just fine. Or, my preference is to just install an S&B LLY Intake Elbow. This will remove just the problematic piece and retain your factory intake. The cost of each options is around $200, and they perform the same way. Next it is time for tuning. A standard box programmer reads your stock file out, modifies 10 – 12 parameters, such as rail pressure, timing, boost, and then locks to your truck when it flashes the tune in. EFILive tuning is custom tuning software that allows users to manipulate 150 – 200 parameters. This gives you a more complete tune that can be calibrated for any setup. There are many custom EFILive tuning companies out there to choose from. The only option I would consider is the SPADE by DuramaxTuner.com.

 This will give you custom EFILive tuning on an easy to use hand help device and a DSP5 switch. A DSP5 switch is a small, 5 position, rotary dial switch that you install under the dash and wire into the ECM harness, giving you the ability to rotate between 5 tunes on the fly. Finally, throw a 4’ Flo-Pro exhaust under the truck. This gives you the deep throaty sound that diesel owners love.

**1: SPADE Jack - EFiLive tuning with DSP5 Switch**

**2: S&B Intake Elbow **

**3: Flo-Pro Exhaust**

 

 

 

If you have an all stock LLY and want to do everything you can to it without building the transmission, DuramaxTuner.com has a bundle package called the DT400 Power Pack.

 

[View full post](https://blog.duramaxtuner.com/blog/top-3-mods-for-your-lly-duramax)

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