I have y-pipe straight pipe dumped right now. 5.4L 3v

What would the change be if I was to eliminate the Y-pipe and run true dual staights dumped.

I assume the sound would have more rumble and become more aggressive. And the performance should lend towards less torque more HP.

But would the change in sound be that noticeable and worth the time and money to have it done? I really and trying to go for the "pissed off" truck sound. What I have right now is pretty good, I am just looking to get the best I can. Drone is no issue by the way, that can be eliminated by running the pipes over the rear axle, plus my tires and audio system is loud anyways.

Thanks for the input.

 

If you do true duals put an x-pipe on it so you don't get the poping. As for the difference in sound it is going to be noticibly louder and a small difference in tone, but should sound great. I don't know how much they will charge you but my true duals straights custom x-pipe 2 tips turned out lightning style was 250 total.
Blake

 

I know an x-pipe is supposed to tame down the sound of duals a bit. Is an x pipe or y-pipe going to sound better, and I know that x-pipe is supposed to be about the best performance wise.

What exactly is the "popping sound" everyone is talking about. I do want a rumbley dynamic sound.

 

An x-pipe will keep it true duals a Y pipe will will make it di/so. The pop I am talking about is when the motor is coming back down to idle it will pop loudly almost like a backfire, it won't tame the sound any.

 

Fixed.

 

I have true dual 2.25 inch straights running out the back behiknd the passenger side tires.... I LOVE the sound. When you are on the throttle... it sounds AMAZING... really isn't "too" loud at idle either.

 

True duals are louder, but it really depends on the muffler(s).

Here's my 3" DIDO X-Muffler configuration:

https://www.f150online.com/forums/sh...d.php?t=324273

Sound clips are included. As a reference, the Roushcharger is REALLY LOUD, so that should give you an idea of the volume.

 

He is going to run straights, so muffler won't matter.
You should keep in mind that you are going to get cab drone, even if you dump it after the axle. My truck drones like crazy cruising at highway speeds (2100-2600rpm), even to the point that it rattles my dash and my back glass. However the cab noise has a great tone and growl to it, and when you have the windows down and step on the go peddle very hard it changes into an extremely loud very aggressive roar. I like the exhaust turned out the side because it bounces off of everything, and if you have to pass someone who has not been paying attention and think their the only ones on the road, you can deafenetly wake them up.
Blake

 

There is a lot more going on with the Y pipe than you may realize. An X-Pipe and a Y-Pipe perform identical functions. Unlike an H-Pipe, which serves mainly to equalize the pressure between two different exhaust pipes, an X-Pipe or Y-Pipe acts as a "diffuser". As an exhaust pulse comes down one of the two header pipes it hits the X-Pipe/Y-Pipe and "sees" an expanding section. The expansion acts to slow down the flow and increase the pressure. This in turn creates a negative pressure reflection which travels back up the opposite header pipe. If the header lengths are tuned correctly then this negative pressure pulse arrives at the exhaust valve of the opposite cylinder just in time to help scavenge the last of the exhaust gasses from that cylinder (as well as helping to pull in the arriving fresh charge). This happens during the overlap period of the camshaft.

For an X-Pipe it's obvious that the cross-sectional area available to an exhaust pulse doubles as the pulse comes in one of the branches of the X and exits through two others.For a Y-Pipe the cross-sectional area increases from what it is at the inlet, to what it is at the outlet.

So, make sure if you go with an X that it resides in the same place as the Y did and also try to get your cross-sectional area close to the same as the original Y (or at least keep the ratio the same).

 

Great explanation. That makes a lot of sense. Running an x or y pipe, you are still running an exhaust that is close to what is designed for the engine. But when you run true duals with no crossover, that design element is lost.

I think I am going to keep the OEM y-pipe and just run 2.5" over the rear axle. My thinking is that the 2.5" is smaller than the recommended 3", but since I am running no muffler, it should be closer to the optimum back pressure relationship. And I also like the sound I get from 2.5" better than 3".

 

A lot of times the Y/X is placed in a position that allows for plumbing around the transmission. I've read many sources that say you should place the x pipe as close to the engine as possible.

I've read some other performance sources mention that you should place the x pipe as close to the mufflers as possible.

I would think in our setup the pipes are so darned long it won't really matter all that much where the crossover is anyway.

 

I have my Xpipe 3-4 feet from the mufflers http://media.putfile.com/Pacesetter-...DIDO-Magnaflow