opinion poll, true dual or single in to dual

Hueyguy626 · 06-17-2005, 10:16 PM

Should i run true cat back dual with h or x pipe or 3" from the union to muffler with 2.5 out with 4"tips

Hueyguy626 · 06-17-2005, 11:18 PM

someone with this setup answer me!

whistler · 06-20-2005, 10:09 AM

gr8titan has a custom ractive true dual exhaust. PM him and maybe he can help you out. He also has intake and seems very knowledgeable with exhaust in general. Later- Chris

FLA-Titan · 06-20-2005, 11:37 AM

Unless you plan on racing and have the long tube headers , I wouldn't worry about a true dual system.

MO Titan · 06-20-2005, 01:38 PM

Quote:

Originally Posted by FLA-Titan

Unless you plan on racing and have the long tube headers , I wouldn't worry about a true dual system.

Even then the difference wouldn't be that large. However if you are a racer I guess you want every horse you can get.

**gr8titan** · 06-20-2005, 03:21 PM

Quote:

Originally Posted by Hueyguy626

Should i run true cat back dual with h or x pipe or 3" from the union to muffler with 2.5 out with 4"tips

It depends on what you are looking for. If just want an all around moderate performance improvement with good sound, any after market cat-back system will do the job. The major differences are in sound quality, presence/absence of drone and initial cost.

However, if you have bigger plans ahead, and you are a racing enthusiast where every 10th of a sec improvement in the quarter is significant, a true dual in a 2-1/2 inch larger diameter tubing will be a good complement to a set of equal length headers. It is also an excellent backdoor exit for the massive entry of air/fuel mixture forced by a super-charger + CAI.

I have a true dual set up, X-pipe (with cat-delete) and I am looking forward to the availability of the equal length headers and a less expensive SC. All my performance mods are geared towards my goal of a <14 sec street truck. So far, so good for me. My Titan is now a low 15 sec truck.

So the question is this: Is a full second improvement in the 1/4 mile worth 5-6 grand? The answer will be as varied as individual goals and depth of pockets.

MO Titan · 06-21-2005, 06:48 AM

Hey gr8titan, I have a question for you. If you did straight pipes to one dual in dual out muffler, would that be virtually the same as a h/x pipe especially since the single muffler would be fairly large due to the dual in dual out? What is the difference to having the h/x pipe do your mixing instead of the muffler? Would the cross over pipe aid in cutting down the low end loss vs the muffler only? Very interested in the answer.

**gr8titan** · 06-21-2005, 12:14 PM

Quote:

Originally Posted by MO Titan

Hey gr8titan, I have a question for you. If you did straight pipes to one dual in dual out muffler, would that be virtually the same as a h/x pipe especially since the single muffler would be fairly large due to the dual in dual out? What is the difference to having the h/x pipe do your mixing instead of the muffler? Would the cross over pipe aid in cutting down the low end loss vs the muffler only? Very interested in the answer.

You are right in your assumption that the muffler could act as the x-h or y-pipe. There is no big deal with doing this unless you are into technical racing where every little horse adds up. My research shows that the sooner the pressures are "equalized" along the exhaust route, the more efficient is the scavenging of the exhaust gases. The muffler's job should be exclusive to "muffling" not "balancing", but it could do both at a less efficient manner. Take a look at all high end sports cars. Their exhaust tubings are all equal length all the way and joined by x-pipe at the nearest equidistant point. To minimize length discrepancy, both the right and left side pipes meet at the center and exit at the center. These are good engineering designs that can be appreciated.

MO Titan · 06-21-2005, 02:34 PM

So if you had a straight pipes with cross over going into a single duak in dual, I guess what I'm getting at is what does the extra muffler do for you? I mean, you already equalized the exhaust, would an extra muffler make that big of a difference? How much difference?

**gr8titan** · 06-21-2005, 04:18 PM

Quote:

Originally Posted by MO Titan

So if you had a straight pipes with cross over going into a single duak in dual, I guess what I'm getting at is what does the extra muffler do for you? I mean, you already equalized the exhaust, would an extra muffler make that big of a difference? How much difference?

Check my website www.usantonio.com/ractive_exhaust.htm A short explanation of some exhaust principles/theories. However to give a shorter explanation is a watertank analogy. If we compare two identical watertanks, one with single outflow pipe vs one with dual outflow pipes of the same diameter, the watertank with two outflow pipes empty faster. When it comes to exhaust "evacuation" this principle applies in a similar fashion. The muffler is restrictive in one way or another and having two of them will reduce any restriction by half. If you would like to take this principle a bit farther, then having the "least" restrictive muffler (straight flow glasspacks) would be the optimum combination.

I personally have felt a great difference. My best friend has a similar Titan. (04 Galaxy, CC SE) and off the line I would leave him 3-4 car lengths. His truck is all stock.

MO Titan · 06-21-2005, 06:47 PM

Thank you for all of the responses. So, do you use any low end with the straight through design? Last question I promise, compare your design to say the flowmaster 70 AT system witha simgle 3" in off of a 21/2 in to 3" Y pipe with a dual 2.5 out. What kind of a difference in power are we talking about. I don't need like dyno number or anything. What would I notice as a driver. I am sorry, I must sound like a pain in the a$$ by this point. MUST LEARN MORE!!!!!!!!!!

**gr8titan** · 06-21-2005, 08:48 PM

Quote:

Originally Posted by MO Titan

Thank you for all of the responses. So, do you use any low end with the straight through design? Last question I promise, compare your design to say the flowmaster 70 AT system witha simgle 3" in off of a 21/2 in to 3" Y pipe with a dual 2.5 out. What kind of a difference in power are we talking about. I don't need like dyno number or anything. What would I notice as a driver. I am sorry, I must sound like a pain in the a$$ by this point. MUST LEARN MORE!!!!!!!!!!

I don't have personal experience with any commercially marketed cat back systems but if you check out this TT thread, the "Banks Monster System" utilizes 3" single straight flow monster muffler, 3" constant diameter Y-pipe and tailpipe. They are claiming a decrease in OE stock pressure of 3.55 PSI down to .275 PSI and dyno gains of 15-20 HP and 25-30 ft/lbs of torque from the 92% reduction of pressure.

Now let us compare their 3" vs. 2 x 2.5". Size wise, my true dual set-up (equivalent to 5" ID) has 60% more outflow capacity than the Banks Monster 3". However, this is not a linear gain and the big difference ends here. Based on Bank's numbers, despite my dual set-up reducing the exhaust pressure down to .110PSI or a reduction by 97% from stock, there is only a 5% improvement over Bank's 92% reduction. Does this equate to 60% better than the Banks HP/torque? NOPE!! Theoretically, my set-up only provides 5% improvement over Banks claimed gains. Small advantages like these adds up significantly to a quarter mile enthusiast. Add all these small differences (complimentary mods) and you'll end up with very stout HP/torque numbers.