Roar in cab after dual exhaust installation.

[Charlie]

Recently had dual exhaust installed and have roar in cab at certain speeds/rpm's. Truck had single exhaust w/flowmaster 40 when purchased in 2015. Now have 2 flowmaster 40's and have the roar. I have not had very much exhaust done in many years and wonder if this is to be expected?
Muffler shop said installing x pipe before mufflers would take some of it out. Had x pipe installed yesterday and that did not seem to take much of the roar out if any.

 

[4WDKC]

Recently had dual exhaust installed and have roar in cab at certain speeds/rpm's. Truck had single exhaust w/flowmaster 40 when purchased in 2015. Now have 2 flowmaster 40's and have the roar. I have not had very much exhaust done in many years and wonder if this is to be expected?
Muffler shop said installing x pipe before mufflers would take some of it out. Had x pipe installed yesterday and that did not seem to take much of the roar out if any.

is the exhaust dumping under the truck?

 

[Arkansas_V8]

Recently had dual exhaust installed and have roar in cab at certain speeds/rpm's. Truck had single exhaust w/flowmaster 40 when purchased in 2015. Now have 2 flowmaster 40's and have the roar. I have not had very much exhaust done in many years and wonder if this is to be expected?
Muffler shop said installing x pipe before mufflers would take some of it out. Had x pipe installed yesterday and that did not seem to take much of the roar out if any.

Pretty typical to drone.

But it depends where it exits as to how bad it is.

 

[Charlie]

is the exhaust dumping under the truck?

Yes, had them dumped just before rear bumper. Maybe 12 to 18".

 

[4WDKC]

Yes, had them dumped just before rear bumper. Maybe 12 to 18".

thats why the exhaust is echoing under the truck... have tail pipes put on.

 

[Charlie]

thats why the exhaust is echoing under the truck... have tail pipes put on.

Thought about tail pipes but was not aware that it would make quite that much difference.

 

[Craig 85]

It depends what series of Flowmaster you buy. I usually get the Delta flow versions as they minimize drone (more internal baffles). Also, the 3 chamber are much quieter than their 2 chamber versions. I know on my Ram 2500 6.4L Hemi, the recommended muffler drove me nuts with drone at 1800 RPM. It was a 2 chamber. Once I switched to the 3 it got rid of the drone.

 

[SquareRoot]

I recently installed 2.5" dual exhaust on my 85. Headman headers, flow master 40 series exiting straight out the back. Nice, deep sound but actually fairly quite otherwise. Last week I finished rebuilding my doors and I covered the inside skins with dynamat and foil backed jute insulation. That made a HUGE difference in sound level inside the cab. I did it more for the stereo and A/C but was surprised how quite it was. Something to consider.

 

[Frankenchevy]

Same here, 2.5” dual, hpipe, Borla mufflers...no drone. A good amount of insulation in my cab though.

 

[SquareRoot]

thats why the exhaust is echoing under the truck... have tail pipes put on.

X2

 

[Charlie]

Thanks for the replies. I am not very experienced with the many exhaust systems and setups. I will try putting tail pipes on and see how that works.

 

[Keith Seymore]

Recently had dual exhaust installed and have roar in cab at certain speeds/rpm's. Truck had single exhaust w/flowmaster 40 when purchased in 2015. Now have 2 flowmaster 40's and have the roar. I have not had very much exhaust done in many years and wonder if this is to be expected?
Muffler shop said installing x pipe before mufflers would take some of it out. Had x pipe installed yesterday and that did not seem to take much of the roar out if any.

Yep.

K

 

[Arkansas_V8]

thats why the exhaust is echoing under the truck... have tail pipes put on.

No tail pipes. Go deaf, make all your passengers deaf, and make passer bys deaf.

Join the dark side. LOL

4 whopping foot of straights.

DRONE THAT.

You must be registered for see images attach

 

[4WDKC]

No tail pipes. Go deaf, make all your passengers deaf, and make passer bys deaf.

Join the dark side. LOL

4 whopping foot of straights.

DRONE THAT.

You must be registered for see images attach

If you think its loud now, up the compression and change the cam, made my truck a ton louder.

 

[Arkansas_V8]

My wimpy build moves my truck around.

That's all I need.

RV cam, freshen up, you know. Poor people build. Lol