Just installed new exhaust on my 08 F150 5.4 SC. I put the Edlebrock/Saleen (56446) si/do on and I have some droning around 1800-2000 rpms. Plus when i let off the gas and come back on easy, like when your in traffic in town, it has some droning. Whats the cheapest way to get rid of it? BTW, I exited my exhaust like the kit came with just turn downs about a 12" from the back of the truck underneath. Thinking about just getting a new longer muffler with si/do and going that route. I only paid $135.00 plus some shipping for the kit. So getting a diff muff wouldn't kill the bank.

 

Nothing you can do to "fix" drone without replacing the entire system. Everyone with any kind of aftermarket exhaust system has the dreaded 1800 RPM drone. Some more than others, but it's always there.

 

Well that's not very encouraging.

 

umm google dynamat it's quite expensive (to do a 4 door car is about $400-500) but worth it, plus 10th gen and newer f150s already have something similar to it from the factory, so dynamat will make it even better.

 

I didn't buy a suv today because somebody put aftermarket exhaust on it, and it was perpetually annoying. From what I've heard (and I've asked), the best way is to replace mufflers with something quieter.

 

That's the price we all pay for making a trucks sound different. Most of us just get over it.

 

... And some just install a large Maggie muffler ( 2.5" SI/SO, 22"-24" variants) in the stock location, get 75% of a full catback's benefits and effectively suppress any drone....

This truck platform, across at least 2 generations (97-03 & 04-08) has natural resonance in the 1800-2200 rpm range. The only real way to consistently avoid making this objectionable is to stay stock, or install the largest internal volume muffler you can find ( that does not have silly internal baffling or 'tarded chambers or other assorted nonsense).

This of course assumes you are not also dumping under the truck.

MGD

 

Who there .... you can kill drone without a new system. I did it on my 07 5.4 F-150 Super Cab that came with a cat back Flowmaster 40 SI/DO and two welded rear exits.

We found the '07 last Augiust 2009 and instantly fell in love with it and the day we tested it out I told the wife it was too loud, she agreed. The drone was worse at certain speeds / loads. We loved the truck and where the exhaust exits and how it looked, even some of the tone, but that drone was awfull.

Well, we bought the truck. A few days later, I took it to my muffler man and he said he'ld replace it with a Series 50 SUV Flowmaster, for $175. Muffler is over $120 alone. Fair price, I almost did it.

We talked it over though ... my muffler man and I ... and since the 40 and pipes were nearly new, and as I noticed a straight piece of pipe ahead of the muffler 2.5" diameter, 28" long ... I went to auto parts store and picked up a Thrush Glasspack # 24214 , 28" long, bright red, 2.5" ID inlet and outlet, straight thru, louvered core. Picked up a saddle clamp and a short piece of 2.5" tubing. Between the tubing and glasspack, I replaced the 28" straight section with no modification to the original pipes except to drill a spot weld to reuse the rear band clamp ... so I have it if I ever want or need to slip it back in place.

I know that I said 28", but that's what I could see. Match the muffler and pipe assymbly to the pipe after you get the pipe off, it's closer to 30" total length.

In short, I cut a little off one end of the GP to allow for the wide front band clamp, inserted the piece of pipe into the muffler and cut it then so total length was same as the pipe removed, and then I cut and notched the rear end to match and once I had duplicated both ends, simply slipped it in place.

The long 2.5" glasspack with louvered core and packing removed the drone, yet the truck still has a nice tone. Costs was less than $25 ... with a can of high temp silver which I used to touch up and repaint that bright red glass pack.

If I need to do it again next year or two, I will use a stainless glasspack maybe?

Together, a Flowmaster 40 and a long Thrush or Cherrybomb glasspack make up an effective and very pleasant sounding, reasonably efficient muffling device.





I know that I said 28", but that's what I could see. Match the muffler and pipe assymbly to the pipe after you get the pipe off, it's closer to 30" total length.




I sanded and painted it aluminum high heat.

 

Wow, the worst of both worlds.

 

Drone is a function of tailpipe length and shape. I played around with trying to get rid of drone I was getting with a 22" magna flow dual in single out muffler. I almost completely eliminated it but eventually gave up. Google branch resonator. I built and installed one and it was the only thing that really reduced the drone. I eventually Went back to stock and didn't notice any real drop in power and the truck is much more pleasant to drive.

 

Run tailpipes out the rear with smaller tips, say 3" or so. If that fails, larger muffler.

 

How much sound difference would I expect to get if I run my exhaust out to the edge of the bumper. Right now they dump about 12" from the edge of the bumper with down turns. I figuring the drone will still be present but wondering about the sound.

 

A little calmer inside and better toned outside.

 

My drone is gone after spending a ton of $ with the Dynamat..... very simple.

Visual is post # 63.

Read here: http://forums.corral.net/forums/show...ighlight=drone

 

already tried to say this but i don't think they care?

also you could try moving the mufflers farther towards the back of the system, like the 05+ mustangs they really don't drone to bad even with those chitty sounding mac pro mufflers. i'm thinking about doing this on my 01 GT cause i'm pretty much sitting on my magnapacks. that and dynamat.