
Looking for that Banks “Monster” performance with a modest price? Then Banks’ new Monster® Sport is the “cool cat-back” exhaust system you are looking for. That’s because the Banks’ Monster Sport Exhaust is meticulously designed & tested to deliver cooler exhaust gas temperatures. Cooler EGT equals power. This 4" rugged, heavy-duty 100% stainless steel Monster of an exhaust system virtually eliminates backpressure. With air-flows up to 176% better than your Duramax’s stock exhaust, Banks Monster Sport exhaust system is streamlined with heavy-wall tubing and constant-diameter bends — increasing your truck’s airflow while improving fuel economy.
Key Features
- Extensively tested & validated
- 4" constant-diameter cat-back exhaust system
- Virtually eliminates backpressure
- Lowers exhaust gas temps
- 100% Stainless Steel
- Easy install
- Optional 5" rolled-edge polished tip
- Fully compatible with the Chevy/GMC factory warranty
- Lifetime Warranty

With a name like Monster you might think the Banks Monster Sport exhaust system obnoxiously over-powers in-cab conversations and music — not so. Unlike the noisy drone of many straight-through mufflers, this Monster’s muffler is extensively sound-tested and engineered with a unique expansion chamber and spun ceramic, a very high-temperature packing. The result? A rich, authoritative exhaust note that isn’t domineering — yet massively improves flow over the stock muffler! Now that’s a Monster!

Finish off this expertly engineered Monster with the optional Banks 5" rolled-edged tailpipe of polished-stainless steel. It’s double-walled design features a 1/2" air gap — preventing heat from tarnishing its mirror finish. This Monster’s crown adjusts with a clamp, letting you decide its position on the tailpipe. All considered, the 4" Banks’ Monster Sport is one cool cat-back exhaust system.

Banks Monster Sport Exhaust will fit 2001 – 2004 Duramax 6.6L LB7 & 2004.5 – 2005 Duramax 6.6L LLY GMC/Chevy Silverado/Sierra 2500HD & 3500HD trucks:
| Part No. | Body Style |
| 48769 | Standard Cab, Long Bed |
| 48770 | Extended Cab & Crew Cab, Short Bed |
| 48771 | Extended Cab & Crew Cab, Long Bed |

Gale Banks Engineering is a leader in the diesel aftermarket. First and foremost, Banks is an engineering firm. Established in 1958, Banks has grown to 200+ employees on a 12-acre campus. The Mechanical Engineering Department, staffed with world-class automotive people, designs and tests the latest high performance equipment. In the Race Shop, Banks’ special project vehicles feature cutting-edge diesel and gasoline development, multiple turbo applications, mind-boggling horsepower and head-turning style. Sophisticated electronic engineering technologies are applied to engine improvement in the rapidly growing Computer Systems Engineering Department. Gale Banks Engineering designs turbocharged engines from the centerline of the crankshaft, out.
When it comes to testing, Banks’ engineers are as ruthless as they are uncompromising. Only the most advanced equipment and facilities are used for testing and re-testing existing products, production prototypes and experimental designs for performance, durability and compatibility. Ongoing testing ensures unparalleled functionality, product endurance and quality control.
The Banks difference is clearly demonstrated in its Manufacturing Division. While many aftermarket suppliers farm-out designs or assemble “grab-bag kits” from various sources, Banks manufactures to exacting specifications every product it designs.
Gale Banks Engineering applies an unmatched combination of experience, capabilities and design/engineering/manufacturing savvy to provide automotive services and solutions that keep raising the aftermarket industry bar.
Links
- Manufacturer Product Web Page
- Product Installation Manual
- Manufacturer Product Support
- Manufacturer Warranty
Manufacturer Contact Info:
800-601-8072
Gale Banks Engineering
546 S. Duggan Avenue
Azusa, CA 91702








