Has anyone on here designed and fabricated their own mufflers? I think it would be a pretty cool project to do, and experiment to create a unique sound for your car.

I was actually thinking about the same thing I dont believe it would be all that simple, but I may try anyway
graemlins/clonk.gif

c'mon. the import crowd does it all the time. just take an empty can of maxwell house (the big ones) and weld a plate and pipe to one end. then send it out for chroming. j/k

well, that does sound like an interesting project. I wouldn't bother welding the muffler to the pipes until you have run the car though. you will likely have to build a few to get the sound your after. It would be really easy to make one that sounds like crap.

lol, fourfiddyfour...

since the look of the inside of a flowmaster and aerochamber muffs are well known, one could use the basic layout of one or the other as a jumping off point.... maybe on a flowmaster style, play with some kind of coating on the inside to alter the exhaust note, or some kind of sound absorbing mat around the exit chamber to give more rumble to the sound.... play with chamber size and shape.... fun stuff if you have the spare time for an interesting project.

I havent, but a freind cut open a Flowmaster and copied a pair out of Stainless, Came out real nice.

fourfiddyfour,

You aren't that far off b/c it has been proven that an empty rect. boxes just past each collector can be used as expansion chambers to lower sound then into a hi-po mufflers and piping system.

I have been mouthing about creating an all W/D/T Continental perforated inner pipe glasspack exhaust for my car by butt-welding two long ones for the long pipes and then shorter one's on top of each other in the transverse location DOWN both sides but am afraid that it being a true 2.5" and straight through, may still be too loud for my 496!!

I have also looked into using what I call paint "Static-Mixer" inserts installed inside straight pipes and have recently fund out that I can buy them already made, BUT they are pricey to say the least!! THESE should work great if a long enough string of them are used, imho!!!

Same goes for the slotted/perforated cone inserts that fit in either collectors or straight sections of pipe... Just use multiples of them in each side....

pdq67

How bout ten x pipes down the length of the car, wonder what that would sond like? :D

Originally posted by baddbob71:
How bout ten x pipes down the length of the car, wonder what that would sond like? :D Why not eleven? You know, for when you need that little extra push over the cliff. lol

Now that's interesting to think about!!

It just may cancel out the sound waves as they travel inter-mingling together through each "X" deal... Only thing I can see that may cause a problem is that sooo many curves going in and out just may create tooo much pipe friction so flow rates may drop OR back pressure go up some??

But that is about the same type of sound control theory behind the "static-mixer" design..

pdq67

Pd,

If you can stand the sound of an X-pipe my car is so much quieter now its unreal. Exact same headers, mufflers, tailpipes, etc, just an x-pipe added.
Gained a decent amount of power at higher RPMs, car sounds very different. At idle you can't tell the sound difference so much, its quieter, but when you get on it it sounds alot different.
The true dual 3" TT exhaust I had with 20" dynomax hemi super turbo's was loud and mean sounding even with those huge mufflers, the same system with an x-pipe has a similar sounding idle, but very quiet.
If you want to kill off the noise of a 496, 3" pipes and an X should do the trick.
By the way, we side by side tested my 20" dynomax hemi super turbos to a set of tiny little 14" spin techs and the power numbers were exactly the same, except the car was so loud (I went outside to hear the difference where the exhaust exits) it hurt my ears--- it was like an all out race car loud. (I think- loud is not my style though).

I don't particularly care for the x-pipe sound, but it has made my car so much quieter now I like to drive it around alot more than I usually do, even with gas prices up and this thing getting gallons per mile. I can't fill the tank because it leaks when the gas gets warm, but I am trying to work out a system to figure out gas mileage. I reconnected my vac advance which is locked out to 15*, which makes for 52* at full vac+mech advance at cruise.

Sorry for the thread hijack. But x-pipes killed loudness in my car.. It probably saved my arse when I went by a state cop on the interstate in the right lane testing my shifting problem (trans downshifts then just goes to 6500rpm rev limit and won't shift again). If there weren't six cars to the left of me, he would have heard me and busted me.

Matt

Guy's,

I figure everybody know's by now, I dearly love them "cackling, Cop-Calling" glasspacks and that's why I am thinking about installing three 2.5" dia. (W/D/T) of the longest ones I can mount down each side!! It should "cackle" REAL DEEP, imho!!!!

Two long ones and one shorter sideways in front of the axle like stock per side. Stack the two by the axle!!!

The exhaust will be a true straight through design, but I am really worried that six of them won't quiet my big motor down enough to keep "John Law" off my tail??

AND I sure don't need that hassle!!

pdq67

PS., I had about the same setup on my car when I had my .060" over full house 409 "W" motor in it AND it WAS loud too way back when!!

It just may cancel out the sound waves as they travel inter-mingling together through each "X" deal... Only thing I can see that may cause a problem is that sooo many curves going in and out just may create tooo much pipe friction so flow rates may drop OR back pressure go up some?? I'm sure with the more bends the bckpressure would rise but with 3 or 3 1/2 inch pipe I'm sure it would still flow good. I seriously wonder what 3 x pipes in series would sound like with no mufflers. I sould have my son's 331 on the test stand soon, maybe I'll do some testing smile.gif
From my experience, the cackling sound is much more pronounced if the tailpipes are long and reduced after the mufflers, I had a Monte Carlo in high school that had 2 1/2 off the manifolds no mufflers and necked down to 1 7/8 tailpipes over the axle and out the rear corners-had the most crackle I ever heard. Cops loved them. :cool:

Besides quiet the noise, what does the X pipe do to the sound????

I made my own. Based them off the original Flowmasters. They were big rectangular 12 gauge boxes with > <<< > baffles in them 3" in 3" out center-center. Behind my 454 78 Elky at the time they sounded like a howler monkey on steriods :D

""at the time they sounded like a howler monkey on steriods""

He, He!! Love that one, LOL, LOL!!!

JUST "Cackle" for me, please!!!!!

pdq67