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The best sound/loudest mufflers?

djkonore said:
Why are some people saying 3" true duels are not good? Not enough back pressure?
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This may be my new catch phrase: Backpressure is bad. It is always bad. There is nothing good about backpressure.

To make a long story short, people think backpressure is necessary because if you remove backpressure, you increase fuel demand, which leads to running lean if the engine is not tuned for the more efficient exhaust. This undoubtedly led people to believe that the cause of loss of power/extra heat after exhaust change was too much flow, as opposed to not understanding increased airflow equals increased fuel requirements.

People say too large diameter exhaust is bad because you end up dumping the exhaust into what amounts to a chamber, which kills flow. Same thing as what stock manifolds do...dump 4 cylinders worth of exhaust into a single chamber.

Ideally after a header collector your exhaust pipe would gradually decrease in diameter all the way to the exit. In reality none of us have the time, money, or test equipment to do that.
 
as far as I'm concerned, it has nothing to do with back pressure... tho that argument could be made... there's a reason why different size header primary tubes are recommended for different motor apps..

it has to do with some sort of 80's macho mentality of "my vehicle is cool, it has true duals.." :rolleyes: much like the first thing many guys want out of a truck is to get the biggest lift and tires they can get on it as quick as they can..

unless your intention is to run a 1000 hp BB that needs that kinda exhaust, it's stupid and a waste of money imo.... not to mention, more difficult to fit around t-cases, etc...

heck, 2.5 duals with a x-over flows WAY more than ANY SB would ever need...
 
I don't disagree...for most applications if you want to look cool, run a 1 into 2 muffler and get your dual tips that way. If single 3" into dual 2.25 or 2.5" is too wimpy looking for you, put some 3" tips on it.

Duals are a huge PITA IMO, especially when considering the cost (athough not sure the cost/benefit of single 3" or dual 2.5") complexity of routing, and clutter under the truck.

If you need big/dual pipes, run them. But to potentially hurt performance by overdoing it, is kind of going backwards if you don't. I've got duals now, would much prefer working around a single muffler and pipe.
 
You want loud? Get the Pypes Performance Violators. They are loud, stainless steel, lifetime warranty, and are cheaper than flowmasters. I think they sound killer. Youtube 355 k10 pypes violators and pull up the vid with the white stepside k10 of glenns. (chevy305). He may have posted already but im lazy and dont feel like looking lol. If that video doeant make you giddy in the pants.... :doah:


Edit: I got on a computer. Heres the vid.

Here they are on my blazer with a 408 small block. Not really built near as much as glenns. But still sounds sweet.

[youtube]G3sfK-638-Q[/youtube]

And one more of mine



DSCF9730.jpg





Inside view :D

DSCF9749.jpg
 
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meh...ok...but if you just want loud, gimme this:

 
They dont' sound bad, but to me sorta glass pack-ish....do either of those trucks have h-pipes?
 
b454rat said:
They dont' sound bad, but to me sorta glass pack-ish....do either of those trucks have h-pipes?
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I think glenn put an h pipe on after that vid. I dont but want to when i redo mine. They dont cackle like glass packs do.
 
Deuling said:
I think glenn put an h pipe on after that vid. I dont but want to when i redo mine. They dont cackle like glass packs do.
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Ya I put an H pipe in after that video. It smoothed it out some. An X pipe would be ideal though. I didn't link a video to my truck because no video has yet to do it true justice. It sounds waaayyy better in person. I need to get a burn out video because it sounds sooo badass at high rpm under load.
 
As far as the OP's system is concerned. I'd recommend not going over 2.5" duals on a factory sbc. A 2.5" system with an h or x pipe and the Pypes Violator mufflers should be your ideal setup. Do you have to run cats?
 
dyeager535 said:
.

People say too large diameter exhaust is bad because you end up dumping the exhaust into what amounts to a chamber, which kills flow. Same thing as what stock manifolds do...dump 4 cylinders worth of exhaust into a single chamber.
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Yah I am tired of hearing about backpressure its a misused term at best.

What you say there is whats true if you dump your exhaust into a 5" pipe the exhuast velocity decreases, of course not always true but lets keep this a small block discussion. So generally an exhaust needs to be sized correctly, to small and it just can't flow enough, to big and the exhaust velocity is decreased to a point where you get points ( this is an extreme example of course) where the air may be moving so slowly it will cause everything behind it to back up.

Thats why you can tune a header with a different length header extension it changes the optimum velocity and you can pick up torque or horsepower at a certain rpm range.
 
Yep...in a vehicle not running at one specific RPM, or at least a fairly narrow RPM range, you will never get it "just right". But over or under-sized is worse than middle of the road. For all intents and purposes, I think single 3" is about the optimum for the small block 350 under non-race conditions.

If I had everything to do the testing, it would be really fun to run through all the different options and see what you could do. I suspect that in our trucks, even necking down a 3" pipe towards the rear would be possible with no loss in power.
 
your truck sounds great Chris....I wouldn't change a thing!
 
I always find it extremely entertaining to try to spot/communicate with a driver while out on a trail when they have a super loud exhaust.. :D

MM MMMM MMM MM....

WHAAAT???
 
not sure what mine is, havent got under to look yet, but its pretty loud when i put the pedal down, otherwise its pretty quiet.

Sorta like a creeper exhaust.
 
Ye, no emissions required so I don't think I need cats. Those Pypes violators sound badass alright! I had forgotten about those. I was looking at some for my Mustang but I ended up having to sell it before I got them. They might be the way to go.....
 
dyeager535 said:
Yep...in a vehicle not running at one specific RPM, or at least a fairly narrow RPM range, you will never get it "just right". But over or under-sized is worse than middle of the road. For all intents and purposes, I think single 3" is about the optimum for the small block 350 under non-race conditions.

If I had everything to do the testing, it would be really fun to run through all the different options and see what you could do. I suspect that in our trucks, even necking down a 3" pipe towards the rear would be possible with no loss in power.
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When you say necking, do you mean dumping it before the rear axle?

Thats how iv had all my cars and trucks in the past, the only reason i dont think ill do it with this one is the smell..
 
i believe Dorian's refering to a smaller diameter.. necking it down...
 
http://www.summitracing.com/parts/SUM-642135/

Ive been tossing around the idea of one of these for when I build the exhaust for my Ford. Not 100% sure yet, but I do think Ill be going with those chambered mufflers now.

I HATED the 3" in dual 2.5" out 40 series flowmaster. Sounded OK, but you couldnt hear much over the drone, even with a cat in the system still. Went to a turbo muffler to get by.
 
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