Double xpipe?

So I have a 2016 tundra with jba headers with 3 inch mid pipes and all 4 cats paired with stainless works dual 3 inch exhaust. I switched out the mufflers with the corsa pro series muffler. The stainless works system already came with a x pipe. I get a little bit of drone and I did some research and some saying putting a double x pipe would help with that and change the tone a little bit. I know that information is not for tundras (ford,chevy,dodge...).

So what is your opinion on putting a double x pipe?
Pros and cons and does it actually help with drone? Any performance benift?

 

Like I said in the FB group… Helmholtz resonator instead

x pipes are more raspy sound if I remember right, and an H pipe would be better for low end torque (again if I remember right)

 

What rpm is the drone at? A helmholtz resonator will usually take care of it. Nothing more than a closed-end pipe tee’d in to exhaust at a right angle. You can use a bend in the resonator to run it parallel with the exhaust.

I built a very similar exhaust to this:

 

More importantly, what is the current X pipe like? Is it a chamber with a similar look to an X? I is it a real X pipe?

two X pipes, whether built/engineered correct, or not….is not the answer.

A quarter wave acoustical stubbed resonator is the answer if you’re talking about 130hz as the dominating frequency in the cabin.

feel free to call with any questions. 760-877-4234

 

An X pipe helps combat rapsiness, but is higher in pitch than an H pipe. It changes some of the 'womp-womp-womp' you can get from the alternating exhaust pulses from the two banks of a V8 - which is what often translates to rasp at RPM - and smooths out the chop. I don't care for a raspy exhaust - I actually dislike it very much.

 

Double X pipes will dampen a broader band of frequencies but will not attenuate those frequencies as much as a Helmholtz. The amount of the crossover at the X also impacts the tone. I doubt there is much performance if any to gain running a double X.

People don't use them in exhaust design as they are harder to tune since the distance between the Xs is what determines the tone change (look at a trombone). Most cars don't have a lot of space to run a double X

I have the Stainless works LTH and the catback Redline and I know about the drone you are talking about. The problem with their exhaust is the segment between X and the mufflers rings like a tuning fork at certain RPMs. I ended up ordering a shorter Xpipe and replacing those two segments with the Stainless works smooth muffler which fixed the sound. Once I finish modding the exhaust I'll probably dump them just past the wheels instead of of coming of the side. Only problem with this approach is the exhaust drops two inches from their design since the part I replaced wasn't a straight pass through.

Still considering the double X as well since I have the additonal X piece from the original kit. Will probably tinker with it after moving to a new residence.

Edit in addition to a shorter X pipe piece I used these:
https://stainlessworks.net/smooth-tube-muffler-stainless-steel/

 

The other option is to look at the rubber weight dampeners some OEMs ship with their exhausts. These are basically a rubber weight on a clamp. The size of the weight dampens different frequencies; you are "shortening" the pipe in effect which changes the tone. I suspect this will work on the Stainless works setup if it is the same segment of the exhaust I picked up tones from. Only issue is figuring out which size dampener and where to clamp them.

 

I’ve tried all sorts of dampeners, rubber, steel. Big/small. It’s a myth.

the solution to this man’s problem is a correctly built and engineered quarter wave acoustical stubbed resonator installed in the correct location.

 

No it isn't. OEMs use them and they are tunable. The key is having the knowledge of how and when to use them.

 

Ok. I’ll rephrase my comment sir:

Of the tens of thousands of exhaust systems that I’ve built for tundras. And the hundreds of experimental prototypes I’ve tried. With multiple spacers, ballast, rubber bushings. Etc. I conclude that this man’s solution is a quarter wave acoustical stubbed resonator.

thank you for the opportunity to clarify.

 

Looks like Keith has already responded. If you need help, he's your guy.
@dirtydeeds

 

All good Keith. I don't disagree that a helmholtz will have the highest attenuation of the various solutions but you also have to consider "what is good enough" on this specific design. For me reversing/removing the mod was also a factor on why I didn't pick a helmholtz even though I had considered one.

In this case it may not be necessary for him when the culprit is the long connector pipes between X-Pipe and the muffler. I had the same issue on set up with the same system from the same company. It isn't the typical drone people complain about on Tundras or at least it wasn't on my system.

Before opting for the louvered replacement pipes I clamped the midpoints of the pipes with a wider lightly weighted collar and it shifted tone for me but not enough with the weight I had available. I certain a heavier weight in the correct spot would have killed the ping but would have done nothing for the rasp which I also wanted to get rid of.

In the end I had SW fab me a shorter X pipe and integrated the smooth mufflers they offer I couldn't be happier with the tone. I would like to loose the turbo S tube mufflers completely and go with a second set of their smooth mufflers like on one of their older designs for the Mustangs which would ship with a four smooth tube set up.

I get that tone and intent aren't easy to convey in a forum format. I'm not attempting to cackblock your sale for a helmholtz. If OP wants a reversible mod helmholtz may not be for him when other solutions may get the job done. On cost two smooth mufflers from SW will run him $300 bucks (on sale) on top of the custom X pipe so in that regard a DD pipe will be cheaper.

 

+1 for Keith's advice.

 

I sent you a text yesterday around noon

If I remember correctly it's a real X pipe

 

Do you have a sound clip? Curios on how the redline mufflers would sound with the other additional mufflers

 

No unfortunately I didn't record any before and after clips.

No promises but I can reattempt some with windows up and windows down on my next commute with the truck.