Hey, whatsup.....Im running 2.5 inch dual exhaust,stainless shorty headers and heavy packed magnaflo rounds, 454 BB. Full length tubes with rectangular tips. Second set of mufflers installed, figuring get larger with more pack would b quieter. nope....... Want to build some effective tailpipe insert style baffles. Looking for some direction. Was thinking of maybe 4 inch long 1 1/2 inch tube, random drilled with multi drilled end cap?
Motorcycle insert baffles? The're reasonably priced. Pick one smaller than your pipe so there a air gap around it. Maybe drill a few more holes? Just a thought... J pipe attenuation is also an option.
Thats a good plan. Have to experiment on the length and air space clearances. Back pressure etc etc. trial n error gig comming up
From what little I understand about exhaust, the more bends (bake up sound waves) the quieter it will be.
Speedway advertises augers for use in circle track exhaust systems. I use one before the muffler in my OT Ford F150 5.0 Coyote. Really helps.
Thanks for suggestions, have quite a few bends through to rear of car, tried some baffle inserts inside tails, didn’t change a thing. Who has the quietest round style stock muffler out there,?? drastic step may have to b taken, Swap out.
Years ago I used a tightly rolled piece of "hardware cloth" slipped in my 4 ft scavenger pipe and held with a cross pin as my muffler. I just went to the local hardware store, bought a couple feet of it and cut it and rolled it up and slid it in. use a good retainer to hold it in or it might blow out at and inopportune time. No need to know why I know that, but in 1965 a little 4 banger with a 4 ft scavenger pipe straight pipe was about as loud as some of these rice burners with a fart pipe are now.
I know , I like loud too man but this beast is waaay too flanky Tried regular baffle inserts into the magna flows to no avail, Just installed pr 2.25 stock round mufflers and different tips, I think it’s louder than ever . Can these speedway spirals go in after muffler or is pre muffler better?seeing pre muffler just after header ideal Grind fit, weld in are on the way, fingers crossed
I used Harley drag pipe baffles in the lake pipes on my 51'. Doubled em up on each side. Thats the only exhaust I have, straight through the side lake pipes
Another hot rod site I frequent swear by the big Cadillac muffs ! They ALL rave about how they cut the sound wayyy down with out strangling it to death . Smaller diameter pipes make it quieter too but........a built 454 is a LOT to try and quieten. 6sally6
With all this talk of baffles, doubling up, etc. what are the effects on back pressure? I can not answer that. Oh No! I may have just opened yet another can of worms. Well lets see what transpires .
I have already tried to set the record straight on what "back pressure" actually is, and what the function, to no avail. I was told, by a retired sheet metal worker and a retired union carpenter, that I have no idea what I am talking about. I am now just letting people enjoy where they are, and will sit back and watch the world burn.
The quieter the muffler the more horsepower it robs, Engine Masters did a muffler shootout on the dyno, some interesting results so maybe look that up. My experience with the Speedway auger style baffle is that it's restrictive enough to burn the paint off the pipe in that area.
Before adding baffles, etc. place your mufflers as far back in your system as possible and give it a test. You'll likely be surprised. Hopefully your system is full-length to the rear bumper or close to it.
Back in the good ol' bad ol' days when Detroit manufacturers were trying to turn machines into sheep, they added "resonators" after the mufflers, before the tips. This modular approach was effective at reining in a noticeable amount of what was considered uncitizen-like noise. Back then I did my own "experiments" of removing said 'resonators' to see if there may be some predatory growls that could be unleashed. There were. The thing about exhaust pulses is there are basically 2 kinds. One type of pulse is the sound wave that travels at its set speed and is little affected by the usual restrictions; the other type is the slug of gaseous material that can be affected by restrictions. Naturally, most of the exhaust system modifications that can be done affect both types. In general, your exhaust, like most, is overbuilt for the lower RPMs you will experience on the street. Another way to say it is there's plenty of capacity for recreational driving. So unless you need that flow at ultra-high RPMs to win and bring home a paycheck, you can make changes to tone down some noise without dinging your street performance. Torque is acceleration and 454 cubes of it will be responsive beyond your needs and any pinch to quiet down some noise won't be much of a factor.
I've had them installed in a set of lakes headers for several years now, they haven't burned the paint off, and no indication that section of the header is any hotter than the rest. They dropped the sound pressure level about 10db vs no baffles, which is a huge amount; yet they are still loud enough to be enjoyable (still louder than gl*** packs). Whether it's the type of sound you want or not is another thing.
I built mufflers into the collectors in these g***er headers. Exhaust goes down, back up, then down again in perf'd pipes wrapped in gl***. Work pretty well and I get the look I needed. Its a cruiser, not a racer.
I believe they come in either 3.5" or 4" diameter, they are intended to go into the collector. These guys offer them in 2.5", but they are expensive. https://www.spiralturbobaffles.com/ These guys make baffles to insert in your pipes, your supposed to wrap them in fibergl*** wrapping: https://www.carchemistry.com/ You might try these, wrap them in fibergl*** matting: https://www.summitracing.com/parts/stw-pc2512ex Search Summit's site, they have that style in varying lengths, up to 30" I believe.
We'll have to agree to disagree, maybe the horsepower level has a bottleneck effect on the restriction.
A pr of dynotechs enroute, have 11 inch space between ea muffler and headers. Im hearing you can also cap spiral center tube for more db elimination?.There was a Engine Masters episode where they were smashing header tubes to show excessive backpressure really didn't affect overall performance/hp. hmmmmmm
Does it "bark" too much for ya? Does it have an 'H' pipe? An 'H' pipe tames the wild beast of noise and improves response. The best systems use one.
Did u see the one where they hammered header tubes restricting flow, but were still showing horsepower numbers. This puppy just a cruiser.
i thought bout adding....there's room up front, any stipulation on distance from frnt down pipes? is it worth the effort?
The largest diameter straight resonators and turbo mufflers you can stuff in there will quiet it down the most. Not chambered or race bullet mufflers. Also, too much baffle will choke that big block.
I'm not sure of what the optimum distance is, but the cars I had them in were up near the motor/trans area. Worth it? All day. I recommend doing some net digging for actual technical results but the cars I added them to not only sounded better, it made improvements I could feel.
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