Originally Posted by 18psi (Post 1235439)

NP. I think EO's setup is about as quiet as it will get. Maybe add a cat to it since those really help too

Originally Posted by patsmx5 (Post 1235544)

I haven't seen his setup, but I can tell you mine is quieter. And doesn't flow as well either. And my previous setup was quieter still, though almost 30 lbs heavier.

Timk, I don't know if you're serious about the "as quiet as possible" part, but if you REALLY are serious about the exhaust being quiet, a straight-thru muffler is Not the quietest muffler you can buy. In fact, it's going to be the loudest. But they of course flow the best. Anyone that says their exhaust is "quiet" with no cat and a straight-thru muffler is full of crap.

Originally Posted by 18psi (Post 1235546)

lol.
You are wrong. I'm not even gonna try to prove why, it's pointless until you actually experience/test what we're talking about.

Originally Posted by 18psi (Post 1235546)

lol.
You are wrong. I'm not even gonna try to prove why, it's pointless until you actually experience/test what we're talking about.

Originally Posted by timk (Post 1235551)

Hey Pat,

I should have said as quiet as possible using a straight through muffler.

My previous NB had an Eaton M45 supercharger with JR headers, 2.5" 200 CPI cat, 2.5" midpipe going to a straight through Magnaflow 5x11x22" with 2.5" inlet/outlet. It was tolerable, but I would have preferred quieter.

I am currently running a 3" dump pipe, 2.5" 200 CPI cat, 2.5" pipe to the stock MSM resonator and rear muffler. It's barely any louder than a stock MSM (maybe a bit deeper note if anything).

I expect I probably can't match these sound levels with a 3" system, but if I can get close, then that'd be awesome. The car is still very much a street car, I like the option of being able to take hands free phone calls in it and easily talk to my kids riding shotgun when we do mountain passes.

I guess even replacing the MSM muffler with the straight through 2.5" Magnaflow would increase flow considerably?

Cheers

Originally Posted by patsmx5 (Post 1235552)

I have literally run one of these muffler on my miata. Magnaflow straight thru muffler. So I do have actual experience with this muffler on MY miata with a turbo.

EDIT: In 2008. https://www.miataturbo.net/general-m...pinions-21993/

EDIT2: Unless the new ones are wayy better than the older ones? Have they changed a lot? I tried one before and wasn't impressed. Are new ones a lot better?

Originally Posted by patsmx5 (Post 1235553)

My stock 05 Outback is "quiet" as I can't hear the exhaust.

My C63 is reasonable, it's loud when cold but with the windows up, it's pretty quit. From the outside it's loud if you get on it though.

My miata is damn loud. But I have a header, (no turbo..... which do muffle a lot) then a 300 cell cat and a dynomax baffled muffler. It's loud enough that I can leave the car idling, go inside my house, and still hear the exhaust. If you can hear your car at IDLE from inside your house, it's not quiet. :)

Originally Posted by patsmx5 (Post 1235554)

I ran a turbo, 3 glasspacks, and a magnaflow muffler. Pretty much 5 mufflers total including the turbo. It was wayyy louder than stock. You're not going to build a 3" system that's as quiet as stock. Then I put a real muffler on the car, that's baffled, and it was much quieter than the magnaflow, but still it's not as quiet as stock. So yeah, you're not going to build a "quiet" 3" exhaust unless you put 6 or 7 mufflers in there, and there is literally no room for them.

If you ran a turbo, a 300+ cell cat, then a couple glasspacks, and then a real baffled muffler, it would still be considerably louder than stock. Stock is quiet.

I also ran a turbo, 3 glasspacks, and a stock 99' muffler. That was in fact as quiet at stock. But it killed the HP big time. I don't recommend that unless you are okay with less than 220whp.

Originally Posted by patsmx5 (Post 267214)

Ok so I bought a Magnaflow muffler for my new exhaust system. It's a 3" in/out center in/out. Part number 12249. Muffler case measures 5x8x18 oval 24" overall. Looks high quality and is all stainless steel.

Originally Posted by 18psi (Post 1235599)

That's not even close to the one we're talking about. The one you ran I also ran back in like 09, it's like half the size and way louder.



Yeah, that's LOUD! Mine isn't even half that loud. You can't even hear it more than 20' away.

glasspacks suck. They really are not "mufflers" becuase they don't actually muffle anything. they simply take away the rasp. they are resonators
I have tried them, they don't do nearly anything. the key is not length of resonator, but girth (that's what she said? lol). You can have the whole exhaust out of glasspacks, and it still won't be nearly as quiet as one of these HUGE magna's with offset angles or dual chambered (not in the "typical" way either, look up it's construction).

Seriously though, if you haven't ran the exact models we're talking about, you simply don't know what we're talking about.

I've ran one of these big boys in 2.5 and 3 configuations, both were significantly quieter than even a RS3 exhaust mated to a OEM header+OEM ginormous CAT on an NB.

I am crazy about quietness. Trust me when I say: if there was a quieter setup that was as good flowing as this, I'd already have tried it. So far the only way to make this 3" setup quieter is with a spring loaded flapper valve like TurboTim and I think JasonCSBB run. Everything else is louder

Originally Posted by patsmx5 (Post 1235680)

Well sounds like the new ones are different. Sweet, when I get some spare $$$ I'll have to try one for myself.

Also funny you mentioned spring loaded flapper valves, I'm thinking about installing one on my car actually.

Originally Posted by JasonC SBB (Post 1235742)

What's a Magnaflow "dual chamber"?