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The '04 Chevy 2500 HD 6.6L turbodiesel waits patiently on the RBP lift for the installation of the cat-back exhaust system.
 A RBP Cat-Back for the Duramax 6.6L Turbodiesel

We delivered the '04 Chevy 2500 HD 6.6L turbo-diesel to RBP's lift in a quest for even more power development. Trudell suggested that we begin with the installation of his exhaust system, a 4-inch, mandrel-bent aluminized tube arrangement featuring a straight-through, "un-baffled" muffler; a 5 1/2-inch, "slash-cut" stainless steel exit tip and just about the best possible unrestricted flow of exhaust gases. The system is offered for street legal operation with the stock catalytic converter in place like our Chevy and for off-road use with the catalytic converter removed.

The RBP exhaust system results in a significant improvement in performance. Because of the large diameter and design of the tubing, the exhaust gases exit much more quickly. Therefore, the gases do not retain as much heat and may well be as much as 200 degrees cooler than the 400 to 450 degrees normally found in exhaust gases exiting a stock system. In the world of diesel performance, cooler means quicker and, according to Roland Trudell, his exhaust system should increase the performance of the 6.6L by seven to 10 horsepower to the rear wheels. Our dyno figures showed the exhaust system increased horsepower by 18 horses above that gained with the air cleaner. The accompanying photos give you a good look at the large-diameter system and show the highlights of the quick and simple installation.

 

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The stock exhaust system channels the exhaust gases, but not as quickly nor as freely as the RBP cat-back system.
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Our installer, Franck Darnell, removes the four catalytic converter bolts from the rear of the cat.
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After removing the factory hangers, the stock exhaust system piping is removed.
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Here's a comparison of the stock system (right) with its large baffled muffler and the 4-inch, straight through RBP system.
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He then positions the section of tube that fits beneath the crossmember.
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The next tube is lined up to the muffler.
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The new RBP straight-through, un-baffled muffler is installed.
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The 5 1/2-inch, stainless steel tip is positioned for final installation.
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The RBP polished stainless steel, slash cut, 5 1/2-inch tip and the rich guttural sound are a dead give-away that something 'high performance' is happening with this Chevy. We proved it with an 18 horsepower increase in addition to that gained with the air intake system.


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