Question for all you guys w/ stacks...

[cD'amato]

OK Im getting ready to put some 5 inch stacks on my beast. Guy at Berubes was tellon me that depending on weather exposure, aluminum may only last a few years before corroding. Im a little hesitant now because I dont want to have to be replacing exhaust systems every few years. Any input from you stack guys? Is it possible for a stock truck with stacks to run worse with the stacks on it? I was told that engines need a certain amount of back pressure to run at their best. Im not sure if this applies to diesel engines. Thanks!



-Chris

 

[BigUgly]

Chris;

I've got all aluminum under the truck and most of the in-bed stuff. I haven't had any troubles with it in the 18 months of the stacks. Now, my downpipe and some of the system is from a previous exhaust (aluminum also) that is about 30 months old, and no rust. Now, down here, we don't get much snow or salting the road , but I do park outside, about 35 feet from a saltmarsh.

Josiah

 

[cD'amato]

Josiah,



Thanks for the info. Are you using the muffler and resonator still or just straight to the stacks?

 

[ISBPilot]

Yes and No

I have not touched my stacks or under truck exhaust in about 2 years, no problems other than small signs of leaking around clamps under the cab. I have a 4" downpipe, 4" flexpipe back to front of the bed, a 4" elbow going into bottom of cross pipe with 5" curved stacks on top of that.



However, our 87 Pete that my Dad used to drive, I can remember having to change the flexpipe on it a couple of times and the y-pipe once in about 10 or so years. Most of that time he had straight stacks with no curve in them. They catch the most water.



I do not think it is enough of a concern to keep from having stacks. If you use flexpipe like I did it will rust through quicker than solid pipe but it is cheaper and easier to use.



Good luck and happy stackin'.



Todd

 

[cD'amato]

ISB how loud is it in the cab on the 24 valve with no muffler and no resonator?

Trying to do as much research on this as possible before I do it. I want to still hear that turbo whistle like I do now. I dont want the rumble of the exhaust to drown it out!





-Chris

 

[David Muench]

Originally posted by cD'amato

I was told that engines need a certain amount of back pressure to run at their best. Im not sure if this applies to diesel engines.

I don't know if I can claim it doesn't apply to diesels in general (I don't think it does, but there are some wierd diesel engines out there). . But it doesn't apply to turbocharged engines for sure. The least amount of exhaust-system induced back pressure is ideal.

 

[HoleshotHolset]

I agree with Dave.



Any engine with a turbo would prefer to have as little of an exhaust as possible (post-turbine discharge).



My truck seemed to spool faster with the 5" single stack (with 3" straight pipe feeding up inside of it... ) over the muffler/tailpipe setup.



Trust me... . you'll still hear the turbo!



Matt

 

[BigUgly]

Chris;

I origionally had it straight-piped. But with the twin 5" stacks at a pretty low level, it was pretty durn loud in the cab on the interstates. I have since installed a Walker 4" straight-through truck muffler and I like it's sound now more than straight piped. When it was straight-piped, it was a little on teh raspy side and real raw sounding. Now, it rumbles a bit more at low RPM / low Boost, but is over-all more civialized, untill I tickle the loud pedal, then it roars!

Josiah

 

[SOOT]

No back pressure is what you want.



As HoleshotHoleset said: You will still be able to hear the turbo

As for being loud, well lets just say the neighbors don't like the truck In the cab sound is not to bad, of course mine stick up about 20 inches above the cab or almost 9 feet above the ground Mine is straight all the wayOo.

 

[JJW_ND]

No Backpressure!

Several years back in the oil boom years, many drilling rigs ran CAT motors (V12, V16 ???) to power the rig an standby power. At one rig they had to V12 motors hooked up to a common belt (big belt). They ran the drilling rig. These motors screamed on the govenor or hours, days on end. They had a 36" long pipe coming off the turbos as an exhaust system. Loud does not even describe the noise!



jjw

ND

 

[cD'amato]

Seems like it might be a tight sueeze tryin to get a muffler or resonator in there before turning up through the bed into the y pipe. Normally I would just go and do it BUT if I dont like it (too loud in the cab), Im stuck with a hole in the bed of my truck.



-Chris

 

[BigUgly]

Chris;

With the Quad-Cab, there is plenty of room for most mufflers. If I remember correctly, I have about 2-3 feet of room from the down-pipe to the start of the muffler, then just an adapter up to 5" and a 5" Elbow going up to the bed. One this you'll need to check with a muffler is diameter clearences. On my truck, the Transfer-case cross member made it an issue, however, the Walker cleared. At the time I got the muffler, there were two diffrent sized 4" straight through Truck mufflers, a shorter, wider one and a longer, narrow one. I got the long narrow one.

Hope this helps;

Josiah

 

[ISBPilot]

Lots of good info......

With the straight pipe system it does have an increase in noise level. Also you may have read about the "drone" problem. I only experience it around 2200 rpm. A little slower or a little faster and it is gone.



With the windows up and the radio on, it is slightly louder. I can still carry on a conversation and listen to the radio without hollering... ... ... ..... too much. But you will want to turn off the radio, roll down the windows and listen to those babies talk, rather than your passenger. :-laf



If all else fails you can add a muffler to tone it down. I originally put a 4" straight through muffler on mine. But it was too quite.



When pulling, going up a hill, or stomping on it you can hear a difference.



I also think the backpressure issue applies mostly to non-turbo gas engines. The stacks and different air filter both seemed to help and not hurt, turbo spool up and performance.



Todd

 

[CFowler]

-chris-i had all the same questions until 45 min. ago. just installed genos muff elimination kit and i am completly satisfied with the way it sounds. not to loud at all!! idles almost the same,put your foot in itand it sounds real good. i dont have stacksbut it could only sound better. good luck. carl

 

[KWIKKURT]

Aluminized Exhaust systems will last a long time. If you are in a area that uses salt in winter you can always use High Heat paint to keep the corrision down.



As for stack noise I would install a mid to full size muffler. Or to save $$$ use just your resonater You would be suprised at how much difference this makes... . More than the stock muffler.



On the last system we used a Full size Dual Chambered 8. 5" X 43" Diesel Performance Muffler and it fit perfect under a 2001 Ext Cab. The Lenth was exactly what was needed to the turn up to the 5" Y in the Bed... . Kurt

 

[jpickens]

Muffler elimination

I've bent up my own muff. elimination pipe, dropped the stock muffler, and left the stock resonator on... Sounds GREAT! And you can really notice the turbo spooling up quicker... of course i've modified the air intake system to get the air in there quicker as well etc.