Buy Factory Direct: 800-601-8072
’04-05 Chevy/GMC 6.6L Duramax LLY
Ultimate Sport Power System
- Intake, intercooler & exhaust upgrades + advanced tuning
- Massive continuous, useable power
- Honors the host vehicle & improves longevity
- 92 mph in the ¼-mile
- It’s like a stallion on steroids!
Gains Up To:+124 hp/+303 lb-ft
Big Hoss® Bundle
Let it flow.
Banks Big Hoss Bundle replaces the power-robbing factory airflow inefficiencies—including the intercooler—with free-flowing components that dramatically increase intake airflow and air density and expel exhaust with virtually no backpressure.
Colossal power with staying power.
Banks balances the improved airflow with advanced CleanTuneTM Technology that adds up to 54% more horsepower and up to 68% more torque than stock without adding black smoke. This is tire-shredding, scenery-blurring constant-duty power that keeps its cool while blasting you from 0-60 mph 24% quicker and 148 feet before stock!
The secret to longer life.
Forget mis-matched components. Run away from tuners that can destroy your engine. Everything in the Big Hoss Bundle is engineered to work together to maximize your engine’s power, efficiency and durability. Big Hoss honors your vehicle by safely living within the limits of your engine. Your Duramax will run stronger and live longer!
All gains measured at the rear wheels
Watch the video! This short segment from ESPN's Truck Stop gives an overview of the Big Hoss Bundle, as installed on professional snowboarder Tara Dakides' truck. (She's got an '03 Duramax, so there may be some variance between this system and the one made specifically for your truck.)
Please note: Palm Tungsten E2 sold separately.
Test vehicle: 2004 Chevrolet Silverado 2500, crew cab, long bed, single rear wheel
Engine: Duramax 6.6L LLY
Transmission: Allison 5-speed automatic
Horsepower and torque measured at rear wheels.
Note: Banks Horsepower and Torque tests performed with recommended airflow improvements
| Six-Gun, Level 6 with Speed-Loader or PDA | Stock | Banks | Improvement | Results |
|---|---|---|---|---|
| Rear-wheel Horsepower: Best gain |
229 hp |
353 hp |
+124 hp |
54% more |
| Rear-wheel Torque: Best gain |
445 lb-ft |
748 lb-ft @2000 rpm |
+303 lb-ft | 68% more |
| Rear-wheel Horsepower: Peak-to-peak |
246 hp @3000 rpm |
369 hp @3000 rpm |
+123 hp | 50% more |
| Rear-wheel Torque: Peak-to-peak |
449 lb-ft @1800 rpm |
748 lb-ft @2000 rpm |
+299 lb-ft | 67% more |
| Acceleration, time: 1⁄8 mile |
11.49 secs | 10.43 secs | -1.06 secs | 9% quicker |
| Acceleration, speed: 1⁄8 mile |
64.3 mph | 73.7 mph | +9.4 mph | 15% faster |
| Acceleration, time: 1⁄4 mile |
17.53 secs | 15.81 secs | -1.72 secs | 10% quicker |
| Acceleration, speed: 1⁄4 mile |
80.6 mph | 91.6 mph | +11.0 mph | 14% faster |
| Acceleration, time: 0-60 mph |
10.18 secs | 7.71 secs | -2.47 secs | 24% quicker |
| Acceleration, distance: 0-60 mph |
511 feet | 357 feet | -154 feet | 30% shorter |
| Six-Gun, Level 6 | Stock | Banks | Improvement | Results |
|---|---|---|---|---|
| Rear-wheel Horsepower: Best gain |
229 hp |
331 hp |
+102 hp |
45% more |
| Rear-wheel Torque: Best gain |
445 lb-ft |
720 lb-ft @2000 rpm |
+275 lb-ft | 62% more |
| Rear-wheel Horsepower: Peak-to-peak |
246 hp @3000 rpm |
346 hp @3000 rpm |
+100 hp | 41% more |
| Rear-wheel Torque: Peak-to-peak |
449 lb-ft @1800 rpm |
720 lb-ft @2000 rpm |
+271 lb-ft | 60% more |
| Acceleration, time: 1⁄8 mile |
11.49 secs | 10.66 secs | -0.83 secs | 7% quicker |
| Acceleration, speed: 1⁄8 mile |
64.3 mph | 73.3 mph | +9.0 mph | 14% faster |
| Acceleration, time: 1⁄4 mile |
17.53 secs | 16.06 secs | -1.47 secs | 8% quicker |
| Acceleration, speed: 1⁄4 mile |
80.6 mph | 91.2 mph | +10.6 mph | 13% faster |
| Acceleration, time: 0-60 mph |
10.18 secs | 8.00 secs | -2.18 secs | 21% quicker |
| Acceleration, distance: 0-60 mph |
511 feet | 363 feet | -148 feet | 29% shorter |
System Includes:
 |
Banks Ram-Air® Intake SystemFlowbench developed, dyno proven. Improves airflow up to 57%; adds up to +39 hp/+69 lb-ft more than a tuner alone! Enclosed cold-air box; huge 7-1/8" outlet. |
 |
Six-Gun® Diesel Tuner & PowerPDA® |
 |
Monster® Diesel Duals Exhaust4” stainless split-dual system more than doubles stock flow & cuts backpressure 98% for more power & lower EGTs; rich, throaty sound; huge polished tips; safely clears spare tire Or choose the single exhaust... |
 |
Monster® Exhaust4" stainless constant-diameter pipes and straight-thru muffler improve flow up to 176% and lower EGTs. Cuts backpressure up to 98%; rich, throaty sound. Of choose the dual exhaust... |
 |
Techni-Cooler® Intercooler SystemEverything about Techni-Cooler is bigger, including the core area, which has 34% more flow volume. Increases air density for more continuous power. Watch the video... |
 |
Monster Muffler
|
| Application | Year Range | Part # |
|---|---|---|
| Big Hoss Bundle, single exhaust LLY engine | Std cab, long bed |
2004-05 | 47737 |
| Big Hoss Bundle, single exhaust LLY engine | Ext/crew cab, short bed |
2004-05 | 47738 |
| Big Hoss Bundle, single exhaust LLY engine | Ext/crew cab, long bed |
2004-05 | 47739 |
| Big Hoss Bundle, with Diesel Duals LLY engine | Std cab, long bed |
2004-05 | 47740 |
| Big Hoss Bundle, with Diesel Duals LLY engine | Ext/crew cab, short bed |
2004-05 | 47741 |
| Big Hoss Bundle, with Diesel Duals LLY engine | Ext/crew cab, long bed |
2004-05 | 47742 |
Owners Manual(s)
LLY Big Hoss Bundle: We Can Now Walk the Dog off of Any Other Vehicles on the Road
2006-01-14
Justin of Heightstown, New Jersey, installed a Big Hoss Bundle on an ’05 GMC with a 6.6L Duramax turbo-diesel
I am a mechanic and installed three Big Hoss Bundles on two 2005 Dodge Dullies owned by my buddies, Bill Cruz and Steve Hodap, who bought my kit for installing theirs. What a great deal!! I installed the Big Hoss on my 2005 GMC as well, all in one weekend. All three trucks have amazed the s#!t out of us with the performance that we were able to get out of them. I truly believe that we can now walk the dog off of any other vehicles on the road. This was the first install of any Banks parts that I have done and everything fit great—I had no trouble installing anything. The toughest part was teaching the trucks the right shift patterns. Otherwise, everything was great. Thanks for the fun that we are going to have!!
Big Hoss Bundle installation
Maximum airflow and ultimate power. Watch and learn the importance of airflow, how to increase your power output safely, why you need to upgrade your intercooler, cold air intake, exhaust... (this is a Duramax LMM, other trucks may vary).
Featured Video:
Banks Big Hoss Bundle Overview
Accolades
“Looking to take your turbodiesel’s performance to the next level? Look no further than Gale Banks Engineering. ”
— AutoWeek (May '05)