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  #1  
Old 02-01-2013, 12:01 PM
JD454 JD454 is offline
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Cool Stacks on a gasser???

Hey guys I have a 2002 1500 and have been tossing the idea around in my head for a while and was curious about your opinions and any issues I might have with this set up. I have always enjoyed the look of well done exhaust stacks and from a few youtube videos I have seen, stacks would actually sound good on a gasser I believe! So here is some of my questions. I am planing on going with simple 4 inch stacks, nothing gigantic. I already have a magnaflow dual exhaust on the truck and I was curious if I could use the muffler I already have with this set up? Anybody ever done something like this with this engine??
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Old 02-01-2013, 07:29 PM
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I would sell the truck and get a diesel. Don't do it on a gasser.
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Old 02-01-2013, 08:00 PM
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Unless you are building a little red express tribute truck, don't do it, they sound like crap and you'll lose a lot of bottom end because you'll kill your exhaust flow velocity by splitting it into 2 large pipes.
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Old 02-05-2013, 02:59 AM
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So by going with one inch larger piping it kills the low end that much??
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Old 02-06-2013, 10:21 PM
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I have a turbo muffler dumped at the end of my cab. I think the atmosphere is a lot bigger pipe than four inch (even dual four inch!), and I don't feel that I have lost any torque from it. if anything it feels like it has more pep.

A diesel does not need stacks any more than a gasser does, and there are lots of guys with stacks on gassers. That being said... Do what gives you wood and call it good!

I would use a flowmaster super 40. Lots of cackle and tone, would reverberate nicely in those big pipes!

Last edited by ElSombreroNegro; 02-06-2013 at 10:32 PM.
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Old 02-07-2013, 12:24 PM
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Diesels also have turbochargers that create enough back pressure so that they can run larger diameter pipes without a decrease in torque.
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Old 02-07-2013, 04:06 PM
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Old 02-08-2013, 12:27 AM
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back pressure is always, always bad and never ever ever any good, ever. (unless you run a turbo with it). What you REALLY want is high exhaust velocity, low back pressure, and tuned primary lengths to optimize exhaust scavenging through carefully timed pulses creating a vacuum signal on the neighboring exhaust valve behind the outgoing exhaust pulse, which is a fancy way of saying the POLAR OPPOSITE of back pressure. THIS is what helps your low end torque: increasing your volumetric efficiency by using the outgoing air to help suck in a fresh charge during the valve overlap period.

Don't believe a word of it and still think back pressure is good? Stick a potato in your tail pipe and hit the dyno.....

Last edited by ElSombreroNegro; 02-08-2013 at 12:35 AM.
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Old 02-08-2013, 12:57 AM
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I admit, it's easier to say backpressure than go into an explanation of flow rate vs velocity. You aren't going to gain power, but in fact will lose power by putting a larger diameter pipe without taking into account velocity. You either have to custom tune the engine to optimize the exhaust velocity, or you can modify the exhaust. But you basically want to balance minimal back pressure and exhaust velocity.

It is funny that you are arguing against backpressure, but then say to use a Flowmaster. They are one of the more restrictive aftermarket mufflers, compared to a straight flow muffler like a Magnaflow.

Your analogy with a potato is taking it to an extreme, however.

Anyway, my opinion to the OP: stacks on a gasser are pointless and tacky. But it is your truck, and I respect that. Just trying to save you from ridicule lol
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Old 02-08-2013, 01:29 AM
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ask anyone that has run the BAJA 500 or 1000 race
they go over several kinds of terrain
One racer found that he could travel faster than anyone else on the so called flat terrain with his vehicles large non restrictive exhaust
when he came to the hilly terrain, his main competitors made up the time on him
then he hit a washboard section & flattened his exhaust tips, he had to pit for a tire change & gas, the pit crew saw the flattened exhaust & had time to use a pry bar to open them back up a little, no time to do a good job.
the vehicle soon hit the hilly section again & he was able to hold onto position much better & did not lose any speed on the flat land
so there is a sweet spot, in any exhaust system
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