Sinister Diesel Complete Solution Kit with EGR Delete - Duramax 6.6L LLY 2004.5-05 Pickups

In stock
Special Price $1,149.00 was $1,436.25

Engine Rebuild Kits Made to Last and Save You Money

Sinister EGT Delete Kit:*
Highest Quality Materials and Fitment
Stylish Sinister Blue Powder Coat and Logo Dress Your Engine
Includes Premium Hardware
Upgrade with an Intake Elbow or Up-pipe
ARP 2000 Head Studs:
Superior to Aircraft Quality; 220,000 PSI Heat Treatment
Centerless Ground as Near to Perfect as Possible
Post Heat-Treat Threadrolling for 20x Better Fatigue Strength
Mahle Original Head Gaskets:
Multi-layer Spring Steel Construction
Stamped Beading and Polymer Coatings for a Solid Seal
Also Includes Gaskets For the:
Exhaust Manifold
Upper and Lower Valve Covers

2004.5 - 2005 Chevy Silverado HD 6.6L Duramax LLY Diesel Pickup Trucks
2004.5 - 2005 GMC Sierra HD 6.6L Duramax LLY Diesel Pickup Trucks
* This EGR Delete Kit is NOT suitable for Chassis Cab trucks.
* Use of this EGR Delete Kit REQUIRES Delete Tuning.

Sinister Diesel Complete Solution Kit with EGR Delete

Each Complete Solution kit from Sinister Diesel is designed to add needed strength to Duramax engines by making it easy to add a full set of head studs. That way every owner of a high performance Duramax can avoid the most common issues that come with improving your engine's performance over factory horsepower and torque ratings. From the EGR replacements, to correct fasteners to the right size gaskets for your engine, Sinister Diesel helps you take all the guesswork out of strengthening your engine and protecting it against leaks that can cause engine failure.

Kit Includes:
EGR Delete Kit
ARP Head Stud Kit (ARP2000)
Grade C MLS Head Gaskets by Mahle Motorsports
Cylinder Head Gasket Kit by Mahle Motorsports
Gaskets for the exhaust manifold, up pipe, upper and lower valve cover
Valve cover grommets, valve seals, and turbo drain seals

Sinister EGR Delete Kit with Optional Intake Elbow & Up-pipe

IMPORTANT: Use of this EGR Delete Kit REQUIRES delete tuning. This EGR Delete Kit is NOT suitable for Chassis Cab trucks.

With proper tuning, deleting your EGR will extend the life of your engine, reduce maintenance costs and add some power. Sinister EGR Delete Kits are American made in California using superior quality materials and the highest engineering standards. The also feature a sharp looking Sinister Blue powder coat and logo to dress up your engine bay. Customers that choose Sinister parts are never disappointed.

  • Highest Quality Material & Workmanship: Sinister prides itself on using the best materials to craft the most durable and best fitting parts right in California.
  • Stylish Engine Dress: The Sinister Blue Powder-coat not only adds a bold edge your your engine bay, it protects the parts from the harsh environment.
  • Engine Boosting Benefits: Expect Lower EGTs, less white smoke and better low end throttle response. Most Importantly, expect your engine and it's components to last longer.
  • Optional Up-pipe: The Up-pipe is a component prone to failure, so why not ensure against future damage and replace it now with one of superior quality.
  • Optional Intake Elbow: The Intake Elbow takes advantage of the removed EGR System and instead of blocking, allows for an extra air intake, adding some power and torque, not to mention a seriously aggressive look.

ARP 2000 Head Studs

  • Industry Trusted Quality: ARP only uses premium grade 8740 alloy and a proprietary ARP2000 alloy that are rated far superior to "aircraft" quality alloy steels. Secondly, each stud is placed vertically into special racks and precisely heat-treated to 200,000 psi for the 8740 material and 220,000 psi for the ARP2000 material. This procedure ensures complete heat penetration and the results are far superior to those lesser quality studs from other manufacturers who just dump pieces into a basket and hope for the best.
  • Exacting Tolerances: Following heat-treat, each stud is centerless ground to make sure it is as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note lesser quality studs are not even centerless ground - the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned - something that won't happen with inferior quality head studs.
  • Unmatched Strength: ARP studs are thread rolled after heat-treat, which gives them about 2000% (that's twenty times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort.

Mahle Original Head Gaskets

  • Multi-layered Strength: Each Mahle head gasket is manufactured to OEM specifications from multi-layered spring steal.
  • Higher Sealing Pressure: Gaskets are stamped with beading around each combustion chamber to increase sealing pressure and then given additional polymer coatings around the oil and water passages to ensure leak-free performance and a proper seal against micro-imperfections in the head or block surfaces.

More Information
Brand Sinister Diesel
Diesel Engine Duramax 6.6L LLY 2004.5-2005
OEM Make GMC, Chevrolet
OEM Model Sierra/Denali 2500, Sierra/Denali 3500, Silverado 2500HD, Silverado 3500HD
Specific Year 2005, 2004

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Exclusive Freedom Diesel Performance Discounts

Save $45 On Any Order Over $699 w/ Coupon Code SAVE45QUICK


All of our packages include multiple related items at a special package discount. Our packages are designed to make your life easier, usually including all the parts you need to achieve a specific modification.

Price Matching Beating!

We want to make sure you get the best deal possible on your parts. We do our best to ensure we have the best prices in the industy, however, if you find an item cheaper, let us know and we will happily match or beat the price.

Discounts For Shops & Dealers

If you are an installation shop or dealer, give us a call or email for details on our dealer program. We are able to discount most items for shops.

Phone: 855-432-4733 9 AM - 6 PM EST Monday - Friday
Email: [email protected]

We Strive For Extremely Quick Shipping.

Whether you need a part to fix a downed truck, a performance part to get the edge on your competitors on race day, or just something to improve the look or functionality of your vehicle; freedom diesel performance you covered!

We understand the only reason you are purchasing a part, is because you really need it or really want it. We do everything in our power to ensure you get the purchased item as soon as possible.

*** Orders placed before 2 PM Est - Usually ship the same day. ***

Estimated Delivery Times:

- Tuners / Programmers by themselves - 2 to 3 Business Days

- Performance / Race Packages - 2 to 5 Business Days

- General Diesel Performance Parts - 2 to 5 Business Days 

- Lighting, Accessories, Etc - 2 to 7 Business Days 

(Alaska / Hawaii Add 3 Business Days)

Easy Return / Exchange Process

If for some reason, you order the incorrect product, or do not need the product prior to using it, we will accept it back as a return for refund or exchange up to 30 days from delivery. Must be in new, un-used condition with original packaging.

Due to credit card processing fees, shipping, and wear and tear to the packaging often occuring during shipping, returns may be subject to a 20% restocking fee.

If you need to setup a return or exchange, please contact us for an RMA#

Warranty Process

If the product you receive is damaged or defective, please contact us immediately for assistance. In most cases, we can send you a return label and fix the problem very quickly.