Question for Chevy dually guys.
 

I have a 1994 Chevy dually with a 454, throttle body, stock exhaust. I want to put a different exhaust on it to get a little better milage and best performance for towing I can get. This thing needs all it can get!.
What is the best way to do it without putting headers on it? Cat Back? From cat converter back, duals ?
Thanks for your help.
Tony

Re: Question for Chevy dually guys.
 

Well Tony, I think that's the nature of the beast.
I get about 6 mpg with mine and have duel exhaust no converters but don't have the headers if that helps............

Re: Question for Chevy dually guys.
 

I am looking for more power than I am mileage. It is a pig.

Re: Question for Chevy dually guys.
 

Trade it in for a 97 or later. Something with a vortec motor.

Re: Question for Chevy dually guys.
 

Go with the duramax in an 06' or newer GMC or Chevy with the 6-speed allison transmission and you'll get more power plus better mileage.

Re: Question for Chevy dually guys.
 

I had a '96 GMC single rear wheel pickup.....Vortec 454. It had decent power and towed fine. I bought it new and it served me well untill last Sept. I towed a box trailer with various cars inside and also have a pickup camper I used. Mileage was about 10+ towing just the trailer....add the camper and it would get about 9.....

I sold it and bought a 2007 Duramax.......Wow what a difference!......No comparison.....power and mileage.....It tows my trailer like it's not even there....and that is not an exaggeration......Gets 12+ towing and back and forth to work......and better on the highway......I loved my old truck but my Duramax is way better....

Re: Question for Chevy dually guys.
 

it was 96 and up for the vortec ,it is a big diffrence ,in my 89 i had some k&n stuff and a tornado it helped

Re: Question for Chevy dually guys.
 

OK guys, I am stuck with this one for a while. Its not that bad, I dont do a lot of traveling with it, just want to help it out, not trade it just yet, but thanks anyway.

Re: Question for Chevy dually guys.
 

Tony,

You can make some minor mods such as better exhaust, K&N filter, etc. However, your truck is a speed density system which means it does not measure the airflow, it is calculated based on cu.in x rpm and then factored for load, air temp and barometer. The newer stuff has mass airflow so it is physically measuring the air coming in and can adapt for increases in airflow. What this means is that on a speed density system if you modify it too much, the calibration can't adjust because it is still assuming a pre-programmed amount of airflow. Example, early mustang GT's guys put the offroad H-pipe on them doing away with the cats and the cars would have idle issues, surging, dying etc. they ran good at WOT because it goes into open loop and max fuel delivery. In your case you need to maintain driveability.

Hope this helps. See you at the track!

Ron & Meridee
396V S/C