Buy Factory Direct: 800-601-8072
’04-05 Chevy/GMC 6.6L Duramax LLY
Cool Sound. Cool Tip.
- 100% stainless, not aluminized!
- Improves flow up to 176%; virtually no backpressure
- Giant polished rolled-edge tip
- Muffler’s expansion chamber cuts the drone
- A perfect fit
Monster® Exhaust
Physical fitment.
Why consider a cheap, ill-fitting aluminized exhaust? Banks 4” Monster Exhaust is made of rugged, long-lasting 100% stainless steel. It fits better than the competition, because Monster Exhaust utilizes the factory hangers and maintains proper clearance to all under-vehicle components.
All flow, show and go!
With nearly five decades of engineering airflow improvements, Banks has mastered the art of maximizing flow while minimizing backpressure. The polished straight-through Monster Muffler, mandrel-bent intermediate pipe(s) and tailpipe nearly triple the exhaust flow, cut backpressure up to 98%, lower exhaust gas temps and deliver more power to the ground. And the 5” polished rolled-edge tip has a double-walled design with a ½” air gap to keep heat from tarnishing the mirror finish.
Engineered to ditch the drone.
Many straight-through mufflers deliver an obnoxious drone that overpowers conversations. Banks Monster Muffler is extensively sound-tested and engineered with a unique expansion chamber and high-temperature packing. Instead of a drone, you’re treated to a rich exhaust note that’s authoritative, yet civil. It sounds as great as it looks!
System Includes:
| Application | Year Range | Part # |
|---|---|---|
| Monster exhaust system, 4" LB7 | Ext/crew cab, long bed | No cat converter |
2001-04 | 48630 |
| Monster exhaust system, 4" LB7 | Ext/crew cab, short bed | No cat converter |
2001-04 | 48629 |
| Monster exhaust system LB7 | Std cab, long bed | No cat converter |
2001-04 | 48628 |
| Monster exhaust system LB7, LLY | Ext/crew cab, short bed | Cat converter |
2002-05 | 48633 |
| Monster exhaust system, 4" LB7, LLY | Ext/crew cab, long bed | Cat converter |
2002-05 | 48634 |
| Monster exhaust LB7, LLY | Std cab, long bed | Cat converter |
2002-05 | 48632 |
Owners Manual(s)
| Monster Exhaust ('01-07) (Part #96408) |  Download |
'04 Dmax exhaust/tuner: Flat Out F-----g Flys
2005-11-10
Tony of Huntingtown, Maryland, installed a Six-Gun Diesel Tuner, Speed-Loader and Monster exhaust on an ’04 Duramax 6.6L turbo-diesel
I had a Chevy diesel back in 1996 with Banks exhaust and remembered how good it was then, so I bought it again. I installed this exhaust in my garage — no lift, no jack. Off with the old, on with the new in 35 minutes. I build hot rods for a hobby and I have installed everything under the sun in the past 20 years and this was the nicest, cleanest and most precise install I have ever done! So needless to say I had a Six-Gun and Speed-Loader overnited to me the next day. There again, a simple, clean and neat install. I have to laugh every time I drive this beast.
FLAT OUT F-----G FLYS.
Accolades
“Banks has earned a reputation in the truck world for making world class products.”
— Off-Road (Oct '05)