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Exhaust Guide

Exhaust guides are a simple solution to the frustrating issue of in-cab exhaust drone or noise for diesel trucks using after market free flowing 4" exhaust systems. If you truck develops a loud annoying exhaust drone at highway speeds and gets even worse when you are towing a load, then you are familiar with this exhaust drone problem. This problem seems to be more common on some vehicles such as the Duramax, Ford Excursion and some Dodge Cummins. Basically the exhaust drone is caused by a harmonic exhaust frequency which causes the exhaust pipe to make sound that resonates through the cab. Our Exhaust Guide (EG) is made of the same 304 SS honeycomb as out Turbo Air Guides (TAG) which when placed on the down pipe outlet will smooth the exhaust flow and direct it towards the back. They can also be used directly in front of a muffler to quiet the sound down.

Exhaust guides are available in two styles shown in the photo and should always be mounted at or near the outlet of the down pipe to be most effective. Exhaust Guides reduce EGTs and that annoying diesel exhaust drone by directing exhaust gases straight down the pipe. When used at the inlet of an Aeroturbine we have seen EGT reductions of 75F and a mellower quieter sound. Exhaust Guides are available in two configurations, 1E140 which is belled on one end so it can be used in the inlet of the Aeroturbine or 1E141 which is belled on both ends to easily be cut into an existing system or straight pipe configuration. $89

Here is what one customer had to say:

Dave,

We installed the Air Guide honey comb 10" back from the center of the downpipe bend. It is about 12-15" ahead of the Aeroturbine. The initial run was solo, but up a steep hill from a stop. We could not believe the decrease in the noise level in the cab of the truck. This is exactly what I wanted to accomplish. Hard to realize that a short honey comb section could change the tone that much. The overall Diamond Eye exhaust system with the Aeroturbine had gotten louder in the approximately 8000 miles since installation. I did not notice any difference in power or throttle response on the test run. The real test will be towing next week to Banks Lake, over Stevens pass and the climb from Wenatchee up to Waterville.

What kind of life expectancy should I get on the Air Guide, will the honey comb burn out in time?

I will let you know after we return from the lake if their are any other observations.

Bob Jenista

2002 Chev Excab long box

Duramax/Allison - No Cat

Dave,

Here the final installment on the exhaust air guide we installed on the my Duramax. I just returned from two round trips, (900 towing miles over Stevens Pass and the Waterville climb on SR-2) to Banks Lake after installing the air guide. It has quieted the cab to almost stock sound level, if you listen you can still hear the exhaust tone to the rear of the truck, but not reverberating in the cab. We are very pleased with the results of the exhaust air guide. I cannot say that I gained or lost any power as I was well over 19,000 lbs GCVW on this trip, about 1500/2000 lbs heavier than the most recent crossings. Truck still pulled well, but I could tell it was heavier.

Fishing was great on the second trip, Walleye's were finally hitting. Being from Minnesota, the wife and I have to have our Walleye Fix every year.

Thanks for the help,

Bob