Exhaust System Looking for your $0.02

[Thrust_Titan]

Exhaust System Looking for your $0.02

[Sammy Sandbag]

You'll want a crossover pipe in there right where the two banks come together parallel. Either an X or H pipe. I don't know about DynoMax's quality either, I've always considered them one of the lower end brands since they sell them at nearly all auto parts stores.

[Thrust_Titan]

bump update

[gr8titan]

Good plan!
Like Sammy above said, A "balance tube" (H or X) at a closest possible point upstream is a must. I have a custom fab T-304 SS system myself and since your plan is at this quality level, I would highly recommend two (2) separate mufflers (1 for each bank). There's enough space for two mufflers mounted next to each other. Stay with same material (T-304) all throughout your system.

Stay with 2.5" tubing. It is the recommended tube size for vehicles producing 300-400HP. Mathematically compared, a dual 2.5" flows 5% better than the single 3" Banks Monster which reduces the OE exhaust pressure by 92% from 3.55 PSI to 0.275 PSI. Therefore, exhaust BP is lower than Banks at 0.11 PSI with true 2.5" duals.

If you are from the "old school" an exit in front of the right rear tire will help make you save some $$ on the SS T-304 at the same time giving your Titan the looks of a "non-commercial market" exhaust.

My two cents worth of gray matter.

[Sammy Sandbag]

Originally Posted by gr8titan

If you are from the "old school" an exit in front of the right rear tire will help make you save some $$ on the SS T-304 at the same time giving your Titan the looks of a "non-commercial market" exhaust.:

It'll probably also elimate any drone, or at least move it way up the RPM scale.

Thrust, those prices seem way outta wack. That X should run you no more than around $50. That muffler probably around $100.

[RockyMtnTitan]

Doesn't the need for an X/H pipe depend on if the DI/DO muff is partitioned internally, or not. I mean, most of these are open internally, so the "crossover" actually takes place inside the muff. It may help scavenge a bit more, though, by placing an x-pipe closer to the engine, but I don't think it's necessary. True duals are a different story.

[Thrust_Titan]

Bump update

Prices are MSRP not what I will pay

Thanks for the input

Tommy

[Sammy Sandbag]

Originally Posted by RockyMtnTitan

Doesn't the need for an X/H pipe depend on if the DI/DO muff is partitioned internally, or not. I mean, most of these are open internally, so the "crossover" actually takes place inside the muff. It may help scavenge a bit more, though, by placing an x-pipe closer to the engine, but I don't think it's necessary. True duals are a different story.

You're not going to get any scavenging from within the muffler itself, especially with a straight through glass pack style muffler like the one Thrust is looking at. For all intent and purposes, this would equate to a true dual system.

Originally Posted by Thrust_Titan

Bump update

Prices are MSRP not what I will pay

Thanks for the input

Tommy

Damn, I'm suprised they are marked that high even for MSRP.

[gr8titan]

The idea behind the X - H and Y style crossover is to unite the 2 banks of cylinders for better exhaust scavenging (aside from sound attenuation). Instead of 2 separate banks doing their own work, the crossover uses the pulse (exhaust) created by the firing cylinder to create a vacuum in the other bank. When the cylinder from the other bank is ready to fire, instead of the piston having to force the exhaust gases out of the cylinder, the vacuum created by the other cylinder bank helps suck the exhaust gas out of the cylinder hense the term "scavenging". It is also most advantageous if the crossover is installed closest to the engine banks to get the most benefit from the "vacuum" created by the previous exhaust pulse.

A dual in-dual out muffler way downstream will not be able to achieve this function because of its distance from the engine and worsened by the absorbent material and/or baffles (needed for sound reduction) separating the two pipes.

Whenever you can reduce the load of an internal combustion engine, you are more likely to see performance and efficiency gains.

Here's an interesting crossover article and photos from a European BMW site

[ecbmxer]

The pipes don't meet right in the middle though when coming off the headers and cats. They are way over on the passenger's side. So it won't really be an "equal length" system. The driver's side will have to travel alot further. I am still confused on whether to do a banks system or try and get a custom dual setup....choices, choices!

[RockyMtnTitan]

Originally Posted by gr8titan

The idea behind the X - H and Y style crossover is to unite the 2 banks of cylinders for better exhaust scavenging (aside from sound attenuation). Instead of 2 separate banks doing their own work, the crossover uses the pulse (exhaust) created by the firing cylinder to create a vacuum in the other bank. When the cylinder from the other bank is ready to fire, instead of the piston having to force the exhaust gases out of the cylinder, the vacuum created by the other cylinder bank helps suck the exhaust gas out of the cylinder hense the term "scavenging". It is also most advantageous if the crossover is installed closest to the engine banks to get the most benefit from the "vacuum" created by the previous exhaust pulse.

A dual in-dual out muffler way downstream will not be able to achieve this function because of its distance from the engine and worsened by the absorbent material and/or baffles (needed for sound reduction) separating the two pipes.

Whenever you can reduce the load of an internal combustion engine, you are more likely to see performance and efficiency gains.

Here's an interesting crossover article and photos from a European BMW site

Yeah, I understand scavenging, but the amount of scavenging you get is not really something you can gauge by how far downstream the muff is. If the system is tuned properly (i.e., muff selection, pipe dia/length), then you'll still scavenge the cylinders. For instance, look at the Borla system. It's a DI/DO setup w/o an x/h pipe, but still scavenges well because it's tuned properly. I'd think Borla would've included an x/h pipe with their kit if it would have increased the scavenging effect.

As I mentioned, I think you'll get more scavenging by crossing closer to the motor, but the point I was trying to make is that it's not as necessary to have an x/h pipe on a DI/DO muff setup, whereas with a "true" dual setup it is necessary....especially for low-end torque (scavenging) and noise reduction. I do see yours and Sammy's point regarding the packing material having some effect on scavenging, though. Thanks....

[Sammy Sandbag]

Originally Posted by ecbmxer

The pipes don't meet right in the middle though when coming off the headers and cats. They are way over on the passenger's side. So it won't really be an "equal length" system. The driver's side will have to travel alot further. I am still confused on whether to do a banks system or try and get a custom dual setup....choices, choices!

It doesn't really matter if the crossover is properly placed. It's not the distance traveled as much as the pulses matching up properly. Make sense? Probably not.....

[WindsorFox]

Originally Posted by ecbmxer

The pipes don't meet right in the middle though when coming off the headers and cats. They are way over on the passenger's side. So it won't really be an "equal length" system. The driver's side will have to travel alot further. I am still confused on whether to do a banks system or try and get a custom dual setup....choices, choices!

I've asked a number of guys I know who have been racing langer than I have and built more cars and they all point to a custom job for better flow for less money. They also agree on two mufflers rather than one muffler with two inlets and outlets.

[gr8titan]

I found these perfect photos of a perfect exhaust for all of us exhaust enthusiasts. Enjoy

[Sammy Sandbag]

Ah, perfection. Life would be much easier if trucks had their gas tanks mounted centered between the frame rails.