[rubaggd]

should i get true dual exhaust for my 07? 2 40 series flowmasters or 1 super 40 flowmaster with a y out the back? i want whatever is louder and better performance. the true dual will actully be a little cheaper than the one muffler as far as total cost. also if i did the true dual exhaust, should i put an H pipe prior to the mufflers? what exactly would that do? different exhaust tone, less popping? thanks

 

[Nuke]

As a graduate of the Old School, I say true duals.

 

[Chevy4740]

here is my 04 with true dual ehaust video
http://s151.photobucket.com/albums/s135/titan4740/?action=view&current=100_0498.flv

 

[rubaggd]

damn that sounds good. do you have an H pipe? what mufflers do you have. Thats the sound im looking for. hopefully ill get it with the flowmasters. did it help the performance?

 

[Viking606]

Oh yes, old school rules!

True duals with the "X" before the mufflers. Be forewarned, Flowmasters will increase your interior sound level. Some like it, some don't.

 

[Papa_D]

I think it depends on what you are looking for more, performance or loud. I'm sticking with the single because I'm performance oriented but there may be something in a small size dual that offers the best of both. Stick with small pipe to keep power lose low.

 

[BLAK_OH_FO_PHOTO]

wouldnt a x pipe or a prochamber create a scavenging effect? and increase hp? whereas a y pipe has no scavenging. i would think true duals wih a x pipe or a type of prochamber would make more power. correct me if i am wrong. i know on the mustangs the prochamber is one of the highest hp making mid pipes. the way i understand it is the scavenging actully pulls the exhaust through the pipe?

 

[Papa_D]

I'm not sure about anything but the fact that too big a pipe = low end power loss.

 

[TripleC]

yes the x pipe with prochamber was one of the best. but i think it also depends on wot type of headers you put on it. i dont think the 2 engines are very comparable. (titan/mustang) plus i think your backpressure is goin to effect your trq more than HP? i could be mistaken.
i have heard different opinions on both sides of the fence. ive heard that lack of backpressure helps with HP and more backpressure helps with TRQ. and you might be more into trq for your titan if u plan on pulling anything.
from what i have read. it seems the Y pipe on the titan performs better.

 

[Z-Hauler]

I've leaned that X-pipes have a tendency to have better HP gains and overall performance on the mid-top end where H-pipes have better gains and overall performance in the low end to mid range. Both scavenge and no, having both will not help.

 

[Arachnid]

The fastest Titans run single exhaust. It all depends on what you are looking for.

 

[BLAK_OH_FO_PHOTO]

thats the way i understand it too. lower backpressure less tq more hp. more backpressure more tq less hp. but with almost 400 ft/lbs i dont think a lil bit of tq loss i that much of a concern. btw (i know it supercharged but) i read where audible mayhem picked up like 20 hp and 10 tq by unbolting the exhaust after the cats! i would think that kind of hp gain would be worth the tq loss? just my opinion

 

[Chevy4740]

I have been out of town, But as for my titan I don't have an x pipe or h pipe. I will say that the power is a lot stronger, unless you are pulling a very heavy load. I pull about 4k lbs with no problems, and can pass slower cars with ease. If I did the exhaust again I would do it the same way.

 

[pagerdaddy]

I had the Flowmaster 40's on my 04 Titan. There is a thread Sammy Sandbag started that has many pages of pics. I believe my setup was on page 8.

The sound was awesome, but after a year or so, the drone will start to get to you.

 

[Nuke]

yes the x pipe with prochamber was one of the best. but i think it also depends on wot type of headers you put on it. i dont think the 2 engines are very comparable. (titan/mustang) plus i think your backpressure is goin to effect your trq more than HP? i could be mistaken.
i have heard different opinions on both sides of the fence. ive heard that lack of backpressure helps with HP and more backpressure helps with TRQ. and you might be more into trq for your titan if u plan on pulling anything.
from what i have read. it seems the Y pipe on the titan performs better.

The term backpressure has always bothered me. There is no advantage to "backpressure". Backpressure is a result of friction losses, which cost horsepower. Period. The performance gains seen with smaller pipes are from the momentum of the gas downstream scavenging (or pulling or vacuuming or sucking) the exhaust gas from the upstream cylinders. The opposite of backpressure. I think what some call backpressure should actually be called velocity or momentum. Smaller pipes maintain the velocity of the exhaust gas higher which scavenges better. The smaller pipes also create more friction, or backpressure. But it is the momentum that scavenges the cylinders and is beneficial; not the friction losses or backpressure.

The benefits of smaller pipes are most noticable at low rpms, where torque predominates. At low rpms, the cylinders are being scavenged, but friction (backpressure) is not much of a factor yet. As rpms rise, friction and backpressure rise as the square of the velocity (rpm). So at some engine speed, the friction losses outweigh the power gains. At high rpms, where horsepower predominates, large pipes are an advantage.

Larger pipes are good for higher rpms. Smaller pipes are good for lower rpms. Backpressure is not good.

H pipes, X pipes, and expansion plenums are too New School for me.

 

[BLAK_OH_FO_PHOTO]

thanks nuke good info

 

[DeadRiver]

the true dual sounds bad ***!

great thread, lots to think about when mod time comes.

 

[gr8titan]

It's a matter of personal preference and degree of education on the "back-pressure" myth. I have "old school" true duals with exit before the right rear wheels (for shorter exhaust run - less friction losses), Twin 2.5 inch SS Mandrel bent pipes, twin straight flow mufflers and an X-pipe. See the custom fabrication process of my system here:
http://usantonio.com/nissan4x4p2a.htm
I've had it since my 04 truck was 2 months old and I am very happy with it.

Low end torque loss they say with true duals? I have a 4x4 loaded with "pre-runner bling" and my best 0-60 ft is 2.075 seconds with the factory rear turning the HEAVY 305/50-20 Nitto Terra Grapplers mounted on HEAVY 20" chrome rims.

For the audiophiles, here's a slow loading sound clip (10.5MB with video but worth the wait):
http://usantonio.com/100_3725.MOV

 

[BLAK_OH_FO_PHOTO]

sounds pretty good! and a 2.0 60' on dubs isnt too shabby. the only thing about the Ts i dont like is all the popping. down low they idle good but after about 2000 they pop like hell! but if i had to choose good sound or performance i guess i would go with performance.

 

[rubaggd]

thanks for everyones info, i got my exhaust (dual flowmaster 40's with an X pipe) put on last saturday and 3 1/2 mac stainless tips 18"long. I like it, it doesnt seem to be as loud as my 06 KC with 1 flowmaster 40 and single exhaust but maybe its because of the CC VS KC and the exhaust being out the back instead of out the factory location. I cant tell any power difference yet but i guess my computer will eventually reset???