Hi all, I have a 2004 Ex V10 with the Banks PowerPack (incl. exhaust manifolds, y-pipe, cold air intake, automind programmer) and a Flowmaster Super 44 muffler, single-in-dual-out. Stock cat remained in place.

The problem is a cabin drone that sets in at around 65 mph. It gets stronger until about 75 mph. Then, it gets less and almost disappears at higher speeds. When I take the foot off the gas pedal between 65-75 mph, the drone basically disappears.

I believe the reason for the cabin drone is the Flowmaster (FM) Super 44 muffler, although I love the exterior sound and performance. But the cabin drone really sucks. That's why I want to replace it with another muffler to get rid of the drone.

Which one of the FM 50 or 70 series would be more suitable to eliminate the cabin drone? Would there be a loss of performance vis-à-vis the Super 44?

THANK YOU VERY MUCH!

 

For me I would go with the 70. It is designed to be used for towing, which would cut down on the drone.

 

27" or so 3" glass pack, great sound and no drone even towing, my suggestion.

 

Glass-packs have been around since the Fourties and have proven themselves for 70+ years.

 

The 70 did a great job of getting rid of the drone on mine. I like the sound it produces as well.

 

Thank you all!

Isn't a Glasspack very loud outside?

 

Not really, it depends on what you get. A thrush or similar small can glass pack can be very loud. The Gibson is a large can, I have it on mine, and I get little to no drone when towing. The only time it's really loud at all in the truck is when the swingouts are open.

 

here is mine, you decide

 

Great screen name, I am surprised you got that one, it would have been my next choice.

 

Yours sounds louder than Archion's, how long is it?

 

I have a Cherry Bomb 27"L x 3" IN/OUT, I have almost the same on my 5.4 Expedition but its a Thrush 25" i believe.

 

"Which one of the FM 50 or 70 series would be more suitable to eliminate the cabin drone? Would there be a loss of performance vis-à-vis the Super 44? "

Getting back to the OP's actual question, I agree w/ 1Ex Camper.
I run a FM70, the rest of the system stock. No drone at all, even while towing heavy. Very happy with idle sound and low (no) noise level when running.
Definitly a slight performance gain over stock muffler.

 

Those cherry bombs have been around since the fifties, I don't know if Thrush is still in biz though.

 

Thrush is still around. I put one of their welded units on my 86.

 

I have the 70 on mine. Sounds good at start-up and lets you know it's there when you step on it. Sounds similar to stock other than that.