if you go back to the top of this thread you'll notice it is about sound and not performance.

scavenging isn't so much about the kinetic energy of the exhaust, but using the pressure wave of the valve closing to your advantage. That's how to tune exhaust systems, and it varies by RPM. So it doesn't work all that well for applications where the RPM is a variable... better for racing and PTO and such.

When the exhaust valve closes, it creates a negative pressure wave. When that pressure wave hits a larger opening (header collector for example) it creates a vacuum in the tube it just exited. If properly set up, that vacuum will get back to the head while the exhaust valve is still open and the piston is just passing TDC. This creates a slightly lower pressure as the cylinder starts the intake stroke and makes sure that the exhaust was completely removed from the cylinder. The power gains are minimal, but worth it in some applications... A Super Duty pickup is not one of them.

 

i simply said kinetic energy because it is essentially the same concept. the moving air carries energy that when the valve closes, creates negative pressure.

i would think that long tube headers would make a noticable difference in power, and noise too.

if you simply want the noise, cut your mufflers off. there is no sense in going through the hassle of a dual exhaust just because you like it loud.

i agree with the engineer speaking about the new powerstroke when he said that a dual exhaust might sound cool at the strip but will get tiring when you are towing.
in a muscle car, you are rarely cruising at more than 15% throttle or so... if that. in other words, you rarely hear the 'loud' part of the exhaust unless you are getting on it.

when you are towing a heavy trailer, your rpms will put you into the 'loud' portion of the exhaust almost constantly. i wouldnt like it.

 

double post

 

Loud is not what I'm going for... stereo is. You can modify exhaust on a pickup and not make it too loud. That way from the centerline of the truck you can hear the two different banks, one in each ear.

 

Kind of off subject but have you guys heard the stock exhaust on the Nissan V-8 trucks?
Whoever designed that gets a gold star, I'm amazed that's a stock exhaust in these times! Awesome.

 

I've had true duals installed on 3 5.4l f150s. 98,04, and 05 models I liked it myself. I didn't notice and power gains or lose by the seat of the pants. Both pipes where ran to the passenger's side around the gas tank then driver back to the drivers side. I would like to do my PSD but the only place ill let touch my truck doesn't do em. 3.5 pipe is the biggest thing he messes with BTW I am talking about bent and welded exhuast systems.

 

I ha've a true dual on my 03 5.4 f350 it sounds awesome and it gives my truck a good bit of extra torque I'm actually redoing my system with a complete flowmaster kit and dual super 44s

 

On my 2004 F250 156" wheel base I have true duals running 2.5" from each manifold to the bumper with Thrasher chambered mufflers. I did have to make the whole system from scratch by myself with some trial and error bending it but It sounds great to me. At idle sounds quiet but the more you give it gas the louder it gets with a nice tone. If it was a short wheel base the sound may be different and or where the mufflers are located could effect the sound. Im new to this form as soon as I can figure out how to post a sound clip I will. It truly surprised me and like I said I like it but for some people it may be too loud.

 

Upload to YouTube then post the link on here