Buy Factory Direct: 800-601-8072
’01-08 GM 8.1L Workhorse
Bulletproof 100% stainless; ultra-thick flanges welded on both sides; no need for sealant or gaskets; maximizes exhaust extraction and torque. Incl. heat shielding.
TorqueTubes® Manifold Assembly
One look at Banks TorqueTubes tells you how radically different they are from the stock exhaust manifolds. Constructed of heavy-wall, 400-series stainless steel, TorqueTubes have 5/8-inch-thick (0.625") flanges that are welded on both sides and then machined perfectly flat (no gaskets needed). They never crack, leak or fail.
TorqueTubes® tuned-length tubes produce a huge reserve of low-end torque that proves its worth on every steep grade and short onramp. Now your Workhorse climbs faster and stronger, without the transmission struggling between gears. The muscle to stay in higher gears longer not only stops annoying "shift happy" performance, it lessens the load on your engine and transmission. Here's power to reach freeway speed sooner for safe merging and passing.
System Includes:
| Application | Year Range | Part # |
|---|---|---|
| TorqueTube system P-series chassis | GM 4-speed trans | EGR-equipped |
2000-03 | 49509 |
| TorqueTube system P-series chassis | GM 4-speed trans | No EGR |
2004 | 49545 |
| TorqueTube system W-24 chassis | Allison push-button trans | No EGR |
2005-08 | 49548 |
| TorqueTube system W-series chassis | Allison 5-speed trans | EGR-equipped |
2000-03 | 49504 |
| TorqueTube system W-series chassis | Allison 5-speed trans | No EGR |
2004-07 | 49542 |
Owners Manual(s)
Accolades
“When looking for increased power, look no further than Gale Banks Engineering, one of the industry’s leaders and innovators.”
— Truckin' (Nov '04)