following up Bruceman's The inside of a RB muffler pic. Interesting, I decided to tear apart my rusted up SA muffler before trashing it. The design is roughly similar.

 

interesting.

 

yep..

 

Nice, look just a tad rusty! lol

 

only *slightly* similar.

The exhaust has a hell of a lot more restriction looking at the stock one. It has to go all the way to the far end, through a small hole, then come back through a small tube, go all the way back, and then out (traversing the muffler a third time)!

In the RB one it seems like it just goes in one pipe, builds pressure in the muffler, and escapes out the other two. Yeah, the exhaust still has to do a double-u-turn but only over a few inches.

This makes the RB seem pretty good IMHO, when compared with stock. Sure there are straight through designs that would flow more than the RB, but I think the RB is probably going to be as good as you'll get at that sound level, unless you can find something baffled that gives out about the same sound. Perhaps a flowmaster or something.

Jon

 

Huh,they must have made some mods to the stocker by 84.
When I chopped up my stock muffler long ago,I was surprised by how heavy duty it was built.The outer wall was 3 layers,lined with fiberglass matting.And the inner bulkhead walls were cast iron.Both would explain the weight and toughness of the stocker.

FWIW,the RB muffler in that link looks horribley designed.Im glad they changed it at some point.Both the RB mufflers Ive ran are straight through design,yet retain the muted,civilized tone that RB's are known for.

 

my SA whistles @wot....

 

humm thats interesting, can anyone explain what the two pipes in the bottom are for? they just seem to connect to the chamber closest to the output, but the only way the gases would make it out there in the first place is through the two small holes on the plate close to the input side which is also the chamber of the secondary exhaust pipe output.

 

the two tubes go to the rear tips. the top tube is for the bulk of the flow to those tubes, in the reverse direction. like vipernicus42 said, it's very restrictive; those two holes are like wastegates to prevent the thing from blowing itself apart from all the backpressure.

without question, RBs are definately alot better flowing

 

this does give design ideas if anyone were to try to design and weld their own. the use of air sleaves on the through pipes for resonators in particularly interesting - not that I would hope anyone would have need for such large sound insulated pipes going straight through, but nonetheless it could be adapted, say perhaps a coiled resonator pipe or what not... (hint hint - no need to have any presilencers in order to have a quiet, free flowing exhaust with a header) anyway, something to sleep on - night

 

Flowmasters won't take the heat. They last about 3 months and 10,000 miles before they rattle apart and sound like there's change in the exhaust. Ask me how I know...

 

Hyper4mance2k, how do you know?

 

we ran a chambered magnaflow, it liked to dissassemble itself, its just not heavy duty enough. the 3" RB pre silencer worked better and its straight thru

 

This makes me a little worried, I have the Borla turbo mufflers on mine, hopefully they last.

 

I,ve had a flowmaster on mine for a little over 2 years, and it's still great. I've had to have the bracket re-welded once, but I think that was just a matter of it not being solid enough initially, and the vibration eventually broke it loose.

 

Ahh,

Alright just relooked at the pictures again and now it makes sense, i shouldn't try to look at things after long hours of work

 

Well, I sure hope the new RB one is designed better than the one in that link. IMO, its just as bad as that stocker and actually turned me completely off to RB mufflers. I'll stick with my straight through magnaflows.

 

es muy interesante

 

Thats what you call rusted and restrictive

 

Ill have to snap some pics of my RB outlets.
Although the inner pipes dont follow a straight line through the body...(goes from top/front to bottom/rear)....it is a true straight thru,glasspack style muffler.
My guess as to how the RB is able to keep so quiet,is the thick walled construction and large volume of packing material used.The are no baffle walls inside and no flat external walls to buzz and resonate,since the muffler is cylindrical.