Does anyone know if those exhaust tips with lining inside them and those with fins inside actually affect the exhaust tone and in some cases supposedly reduce noise? If so, what tips will reduce exhaust noise?

I have seen them with packing on the walls and perforated cores. They can act as minor mufflers / resonators but don't expect a major sound reduction from them.

The perforated inside lining RUSTS unlike the STAINLESS STEEL exterior. It rusts and starts looking crappy. I know ... been there twice. Sorry if I hijacked your thread but I just replaced another one on my Tundra. "Things aren't always as advertised". About any muffling effects -- I'd say it's zero.

Regards
George60

rev411, tips only have a minimal effect on sound, more for looks. With an aftermarket muffler it has even less effect. Is the banks is a bit too loud?

... Is the banks is a bit too loud?

Yeap, I have been trying to think of something short of replacing it or redoing the tail pipe again. When I first got the exhaust the tail pipe was turn down at the exit more than I liked because of my lowered truck. So, I eventually cut the pipe about a foot from the muffler and it was quieter than stock, no drone at all, but I was getting some exhaust smell in the cab, so I had the tail pipe re-ran with a down spout hidden under the truck near the spare tire, that got annoying, so I had it re-ran it again as it was originally design to run. It seems the shorter the tail pipe, the less drone. Maybe I should re-run it to exist in from of the rear tire, but the banks muffler is so long it will result in almost a 90 degree turn in the tail pipe from the muffler to the exit just in front of the rear tire. I like the performance of the banks (no loss in low end torque), but don't like the drone...not overbearing now with sound deadening material installed, but it is there nevertheless.

That's sucks. I fell you there, drone drove me crazy when my flowmaster was dumped. In town it's okay but on the freeway I wanted to go doggy style with my head out the window. I have heard there are baffles you can insert in your tailpipe to muffle the noise however I've never checked into them and imagine they reduce flow. Are you running stock diameter pipe or 3"? My muffler guy told me bigger diameter will be louder and is more likely to drone.

The tailpipe acts like a pipe organ when it drones. Different lengths produce different tones just like a pipe organ. Eventually if you make it so long or so short, the drone frequency is so far away from the engine's own sound, it never hits the drone point.

Put the original Banks tailpipe back the way it was. Then about half way down the length of the tailpipe, cut a hole in the side of the pipe and weld in a 26" long section of pipe in a "T" configuration. This added piece of pipe runs horizontally and should be capped off at the other end. This is how you build a Helmholtz resonator. It will cancel the drone at around 1600-1800 rpm highway cruise.

Humm...anything is worth a try but putting the original pipe back on is not an option since I've gotten rid of it but I will talk to my muffler shop to see what they can do about the T configuration. Thanks.

How long is your tailpipe now? Depending on how your changes affected the drone you might have to adjust the 26" length to make it work.

You ARE legendary! I've never heard of that but it makes perfect sense. Just like a hammer arrest on copper water pipes.(which hold an air pocket to eliminate pressure jolts) That's really a great idea. Where did you learn it?

Lots of people have done this. Corsa uses it in their systems, albeit much more eloquently....their's is internal to the muffler.

How long is your tailpipe now? Depending on how your changes affected the drone you might have to adjust the 26" length to make it work.

The tailpipe is basically the same lenght now as the original piping. I was wondering however, if the capped off 26" appendage to the tail pipe would cause any build up in back pressure?

No brother. The exhaust still flows straight through the "T" as before. No exhaust flows in the resonators because they are capped off at the ends. Depending on which mufflers and exhaust manifolds you have, your catalysts are likely more restrictive than anything else in your exhaust.

I did measure slightly over a tenth improvement in my quarter mile time with the MagnaDrone system installed, and this did not diminish after I built the resonators.

The best part about these resonators is, for some reason you don't like them, it is not a big deal to remove them and go back the way it was. In fact mine were arranged on a clamp / flange system....not welded on the tailpipes.

Mr. Creosote,

Do you by chance had a picture of this "T" configuration?

Great info here,I have an answer to Rev411's first question. I had a Zoomers cat-back system on my 06 for a while.Too much drone for me but the tip was just what Rev411 is talking about.Go to their site and you'll see it.

Here is a cell phone photo taken from underneath the truck in the area between the differential housing and the spare tire. You can see the 26" resonator pipe protruding from the holed tailpipe, going inboard from the tailpipe and sitting horizontally.


http://www.tundrasolutions.com/gallery/files/5/4/7/3/7/photo-0019.jpg


I made two of these since I have dual tailpipes. Instead of welding the 26" pipe into the holed tailpipe, I built a flange for the 26" pipe and then clamped it onto the holed tailpipe.

BTW this is on a Magnaflow dual system. I have had both TRD and Magnaflow systems now and FWIW Magnaflow drone is around three times louder than the TRD. The drone is absolutely deafening. My plastic dash panels would vibrate at that magic 1600 - 1700 rpm highway cruise. The resonators cancel this very well. :heh:

Brother, you are my hero.

You have a supercharger. You are my hero. :heh:

Yeah. The supercharger is in the boxes vs. the truck for now. I have an appointment with Sparks Toyota on Nov 25th for the install. I had planned to do the VB upgrade first and thought, heck put that money towards the SC'er and do the VB upgrade later...now I am in the waiting game but it is closer today than it was yesterday.

:focus: I hope this is not a dumb question but in regards to the cutting the hole in the side of the tailpipe, how big should the hold be?

The MagnaDrone tailpipes are 2 1/2" and the resonator tubes are a size smaller....I believe I cut them from a stock exhaust, the front pipe portion, so probably around 2 1/4". The hole should be just large enough to mate with the diameter of the resonator tubes.

Tell me more about your drone. Mine happened at highway cruise, around 1600-1800 rpm. That is what these resonators are tuned for. What is yours like?

1600-1800 rpms is exactly where I get the most drone when cruising between 68-72MPH. I am going to hit up my muffler guy tomorrow. He was out today...hopefully, we will be droneless by the weekend. :thumb:

You have the same problem I did, so the same solution should work. Remember to build two of them if you have duals. The ends have to be capped off.

I made it to the muffler shop today. I have made 4 mods to the tailpipe of this banks system to the point I can't keep up with what I have. The last mod I did left about a 45 degree bend directly in the spot needed to weld a 26" pipe to make the resonator. The only way to get a pipe in a "T" configuration between the rear diff and in front of the spare tire would be to put it in the bend or the weakest part of the pipe, so I opt not to do that. I suppose one day someone will make something that you can stick inside of any tailpipe, regardless of lenght, to eliminate drone. Oh well, I get the SC'er installed next week and will probably forget all about the drone because of the sound of tires spinning.:eyebrows:

Well, since the last mod to my tail pipe prevented me from doing the helmholtz resonator, I was able to find a resonator tip by Wicked Flow at Item Details (http://www.bearriverconverters.com/ItemDetails.aspx?ItemPK=88c92aad-aa94-4f7e-ae66-f9784260e234)

The tip did help with the drone problem. It did not completely eliminate the drone at cruising speeds of 70MPH, but almost. It is significantly better.

That is not a bad idea. My new Borla system drones a little, albeit only a fraction as much as the MagnaDrones did. I might buy those tips and pop them in place of the Borla tips. :heh: