Exhaust Systems- what are you running?

[DuvallDawg]

Looking for a great performing/ sounding exhaust system. Nothing obnoxiously loud, just something with some good rumble.

Running a 351W in a 77 EB, currently running twin straight out the back, have heard that routing out the sides is better for sound and smell?

Any input is appreciated!

Thanks!

 

[blubuckaroo]

I'm running dual 18" Magnaflows with an "H" pipe. It sounds good but my favorite small block Ford sound comes from a pair of cheap turbo mufflers and 2.25" tailpipes. It has that nice raspy crackle.

 

[Numberfool]

I was running glass pack "cherry bombs". Awful.
Been researching the threads as well for that great balance between my neighbors not hating me and still enjoying the rumble of the 302. Love the sound, just don't want the lady across the street glaring at me in her bathrobe as I warm it up in the morning.

 

[blubuckaroo]

The exhaust doesn't need to be loud to sound good. Just don't make the tailpipes too big.

 

[ugly74]

Ive got 2.25" duals, with an Hpipe and dynomax turbo muffler, pipes turn out to the side after the rear tires. Sounds badass, but not too obnoxious. It does resonate quite a bit when im just loafing around town though.

 

[tasker]

2.25" true duals and Summit's flowmaster knock offs exiting the sides in the rear behind the wheel with a 351w as well.....love it!

 

[Scoop]

I'm running reversed Magnaflo 2-in, 1-out super single. I like it enough that I did the same thing on my 78 FSB.

 

[01Dudley]

You guys should look at the CHERRYBOMB VORTEX muffler. This is not a glass pack, but a muffler. Don't get confused by the name. The VORTEX is a muffler that is designed to have a deep tone out the back of the exhaust giving a nice cruising tone, but on the other side it is also designed to eliminate inside noise and cruising drone. This muffler also outflows most other performance mufflers. It is the best flowing CHERRYBOMB muffler out and flowed 30% better than the CHERRYBOMB PRO(which is basically a knock off of a FL**&*^ER). Combine this with the our DUFF DUAL exhaust system that can be installed in your driveway for a great sounding do it your self system. The 3090VORTEX kit comes with everything you need if you have our full length headers or you can add the 3090manifold pipes to the kit if you are still running stock manifolds.

 

[asinor]

You guys should look at the CHERRYBOMB VORTEX muffler. This is not a glass pack, but a muffler. Don't get confused by the name. The VORTEX is a muffler that is designed to have a deep tone out the back of the exhaust giving a nice cruising tone, but on the other side it is also designed to eliminate inside noise and cruising drone. This muffler also outflows most other performance mufflers. It is the best flowing CHERRYBOMB muffler out and flowed 30% better than the CHERRYBOMB PRO(which is basically a knock off of a FL**&*^ER). Combine this with the our DUFF DUAL exhaust system that can be installed in your driveway for a great sounding do it your self system. The 3090VORTEX kit comes with everything you need if you have our full length headers or you can add the 3090manifold pipes to the kit if you are still running stock manifolds.

It absolutely is a glass pack. The white stuff around the edges is fiberglass roving. Its just oval instead of bullet shaped so it holds more packing which diffuses more of the high frequency sound. They will hold up better than the bullet style, but only time will tell how deterioration of the fiberglass affects the sound.

 

[sanndmann3]

I'm running Wild Horses shorty header modified for side exit. behind that are Flow master 50s. I like the sound and exhaust fumes are a lot less than when I had rear exit exhaust. I used to have cheap turbo mufflers from Summit but they were too raspy.

 

[blubuckaroo]

It absolutely is a glass pack. The white stuff around the edges is fiberglass roving. Its just oval instead of bullet shaped so it holds more packing which diffuses more of the high frequency sound. They will hold up better than the bullet style, but only time will tell how deterioration of the fiberglass affects the sound.

Then by that reasoning, an oval Magnaflow muffler is a glass pack too?

 

[Timmy390]

I was running glass pack "cherry bombs". Awful.
Been researching the threads as well for that great balance between my neighbors not hating me and still enjoying the rumble of the 302. Love the sound, just don't want the lady across the street glaring at me in her bathrobe as I warm it up in the morning.

Running CB's and LOVE'em. Loud and sound GREAT. I've been told may times how good my old rig sounds. No old lady's near me.....LOL

Tim

 

[707Bronk]

My current setup is a 2 into 1 system with a magnaflow. I used a flowmaster Y-pipe just before the muffler to make routing easier. 2.5" pipes into the Y-pipe and 3" rest of the way.
I made the switch because the ZF swap (mainly the BC crossmember) made it nearly impossible to run true duals.

Previous setup was a dual flow master 40 series with a crossover/H-pipe.

The dual flowmasters were really throaty, very aggressive and I had a hard time convincing myself to go the 2 into 1 system. But, the dual flowmasters were very loud at cruising speed and a little too loud while wheeling.

The 2 into 1 magnaflow setup is a really deep and rumbly. Still sounds awesome, but is a LOT quieter at cruising speeds, and it seems to idle a little better. Haven't noticed any lack of power either.

I am not using headers, just stock manifolds with 2.5" collectors. Headers are not worth the money IMO, I know people will disagree.

I used to have a 66 bronco with a 351W and dual exhaust with super turbo mufflers. These sounded really good as well. Pretty distinct sounding.

Also, running pipes straight out the back is a sure way to have exhaust fumes circulate back into the seating area. Routing out the sides, either before the rear wheels or after rear wheels, will blow the fumes downstream of the rig.

 

[01Dudley]

Originally Posted by asinor View Post
It absolutely is a glass pack. The white stuff around the edges is fiberglass roving. Its just oval instead of bullet shaped so it holds more packing which diffuses more of the high frequency sound. They will hold up better than the bullet style, but only time will tell how deterioration of the fiberglass affects the sound.

Then by that reasoning, an oval Magnaflow muffler is a glass pack too?

TOUCHE!!!

Thanks for getting my back BLUBUCKAROO.

 

[asinor]

Then by that reasoning, an oval Magnaflow muffler is a glass pack too?

As far as I'm concerned, any muffler that has any type of packing is a glass pack.

There are 3 basic types and a hybrid.

Chambered / Baffled: Cancels sounds by inverting sound waves with reflection. Flowmaster is a good example of this.
Resonators: Uses Helmholtz resonatios to invert sound, straight through design. Corsa uses this type.
Glasspack - Absorbs sound in a packing material such as fiberglass or steel wool. Classic Cheryr bomb.
Turbo style: I'd call this a hybrid, an S shaped perferated tube surrounded by... you guessed it, fiberglass roving. Walker, thrush, almost every major manufacturer builds this type.

I'm not knocking them at all, they can be tuned to just about any need, just stating they are technically a glass pack regardless of the shape. They will change sound over time as carbon builds up and the roving degrades from heat. They will probably physically outlast any chamberd design.

I will knock chambered/flowmaster type, its a cheap design with poor flow characteristics, and generally unavoidable drone. I wouldn't put one on a high rpm performance vehicle or highway driven vehicle since I out grew my louder is better phase 17 years ago.

 

[jim3326]

The 2 into 1 magnaflow setup is a really deep and rumbly. Still sounds awesome, but is a LOT quieter at cruising speeds, and it seems to idle a little better. Haven't noticed any lack of power either.

I probably idles better because your getting better scavaging. My local muffler guru said if you use too big of a tube, it kills the scavaging.

I'm using shorties into 2 1/4" into 1- 2 1/2" Thrush Turbo and dump out the side in front of the tire. It's not loud at all and has a nice drone to it. Don't have it drivable yet so I don't know how the power is but revving it, it's real quick. I made a video to get the sound (picture sucks, old camera) but I can't figure out how to upload it.

Jim W.

 

[707Bronk]

I probably idles better because your getting better scavaging. My local muffler guru said if you use too big of a tube, it kills the scavaging.

I'm using shorties into 2 1/4" into 1- 2 1/2" Thrush Turbo and dump out the side in front of the tire. It's not loud at all and has a nice drone to it. Don't have it drivable yet so I don't know how the power is but revving it, it's real quick. I made a video to get the sound (picture sucks, old camera) but I can't figure out how to upload it.

Jim W.

Thats what the muffler guy said too about the idle after I commented about it to him.

Its important to remember also that the exhaust fumes cool the further down they exhaust system the fumes get. The cooler the exhaust fumes get the more dense it becomes.

I've been told by mechanics and exhaust gurus that because of this you actually want to decrease the pipe size the furhter away from the manifolds you get. That is, on a crossover/H-pipe dual exhaust you may start out with 2.25" or 2.5" at the manifolds to the mufflers, but exit the mufflers with one size smaller pipe all the way to the tailpipe. I'm no exhaust guru, but I've been told that this will acutally decrease scavanging and maintain some needed resistance in the exhaust.

My exhaust, being a 2-into-1 has 2.5" tubes going into the flow master y-pipe then 3" all the way thorught the magnaflow muffler to the tail pipe. It does follow this reducing scheme of scavaging reduction that exhaust gurus have told me about.

Wondering what others think about this?

 

[707Bronk]

Here is the Flowmaster scavenger Y-Pipe I used. The muffler guy said it has some design feature at the Y that reduces scavanging. Didn't look like much to me, but he's the most recommended exhaust guy in the area, so I have a hard time doubting what he says.

 

[asinor]

Thats what the muffler guy said too about the idle after I commented about it to him.

Its important to remember also that the exhaust fumes cool the further down they exhaust system the fumes get. The cooler the exhaust fumes get the more dense it becomes.

I've been told by mechanics and exhaust gurus that because of this you actually want to decrease the pipe size the furhter away from the manifolds you get. That is, on a crossover/H-pipe dual exhaust you may start out with 2.25" or 2.5" at the manifolds to the mufflers, but exit the mufflers with one size smaller pipe all the way to the tailpipe. I'm no exhaust guru, but I've been told that this will acutally decrease scavanging and maintain some needed resistance in the exhaust.

My exhaust, being a 2-into-1 has 2.5" tubes going into the flow master y-pipe then 3" all the way thorught the magnaflow muffler to the tail pipe. It does follow this reducing scheme of scavaging reduction that exhaust gurus have told me about.

Wondering what others think about this?

This is ture. It is Bernoulli's Law. A given volume of gas travelling through a smaller diameter tube will flow faster than the same volume of gas through a larger tube. Boyle's Law states that a given volume of gas at a given temperature has a given pressure and as the temperature decreases, the volume decreases if the pressure stays constant. So lower volume (because it is cooler) in the same size tubing = slower flow. Reducing the diameter of the pipe increases the gas veolcity and actually deacreases the pressure slightly (Bernoulli again).

Header wrap and ceramic coatings approach it from the angle of keeping the heat in and therefore higher volume and speed in a given size tube.

It comes down to is having a system that is properly sized for your engine and usage requirements. An Internal combustion engine is just a glorified air pump with a built in heater when you get right down to it. Doing anything without having real temp, pressure and volume numbers along ideal targets will just be hit and miss and you will be reduced to trial and error. The target values are as elusive as anything else as each engine setup will want something slightly different. If you can calculate it all more power to you. If it works for one setup it should be close for a simliar setup.

 

[BlackCat4]

I'm Running duel magnaflow with headman longtube headers love it great sound.Thay dump out of turn Downs right in front rear axle, but I am fabing a heat sheld for my Holly fuel pump to cool down the pump it is close to pipes.