Muffler Size
 

Time for a new muffler. I have been perusing the Magnaflows on Magnaflow Performance | Discount Performance Auto Parts | Performance Exhaust Systems | Flowmaster Performance Mufflers site and trying to decide which size. I'm running a 2 1/2" exhaust.

From the looks of things, it appears that I will be using a 5x8 oval. It is available in 14" and 18" body length, 20 or 24 OAL.

What is the easiest to FIT, center in center out?, offset in/out?

From some photos in other threads, it looks like the 14" body, center in/out would fit well.

I want quiet, though, at cruise. I'm guessing the 18" body will be significantly better in that regard over the 14".

I also am assuming that center in/out has to flow better than offset in/out just because of the golfball test. Do the offset Magnaflows flow as well as center in/out? Are offset good enough and possibly quieter than center in/out when comparing Magnaflow to Magnaflow?

I want to do this right and do it once. The car will eventually end up around 10 PSI.

Your original muffler thread has a lot of good info in it. I still think the giant magnaflow <12578> I used is the way to go. And the offset/offset makes it possible. It's a little louder now on full throttle, but still quiet at cruise. Offset/offset has the better flow in my installation since it provides less curve to get into the muffler and back out.

GET THE BIG MOTHER.

you'll thank me.

ask braineack. he rode in my car on sat and wouldn't shut up about the exhaust.

The offset mufflers will still pass a golf ball. They turn mount the tube diagonally.

Not real sure about the internal construction of the split ones though. (single to dual)

Even with the 2 1/2" exhaust, transition it up to the 3" unit?

Yes. Or why not? IF you ever decided to go up on the exhaust size pre muff you'd have the muff to match. And it's not going to hurt to have it larger. Besides, we already know the 3" is hush with a full 3" exhaust.

Mine is 3" center in, offset out. And it will pass the golf ball test.
http://systemstrategies.com/miata/ex...053008_010.jpg

OK, I'm convinced. Ordering MAGNAFLOW MUFFLER 6" X 12" 22" BODY 3" O/O 12578 today. Maybe it will smooth out my jumpy MAP pressures at the upper RPMs. Magna thought it could be from excessive backpressure and it is distinctly possible with the old Flowmaster.

amongst other things...

get the same in 2.5".

you might need to upgrade the mid pipe while yer in there. wink wink.

My magnaflows are center/offset to match up with the entry and exit bends better. Also I went with resonated tips to help keep her quiet under cruise. Works like a champ; sounds awesome at heavy loads but under cruise isn't loud and doesn't drone.

I went from a flowmaster type muffler to a cheap POS turbo style muffler and got improved flow (quicker spool). Word is that the chambered mufflers are bad for turbo'd cars.

FWIW - Enthuza (the original owner) was stepping up their muffs a 1/2" in diameter from the preceding pipe dia. because it showed better spool on the dyno (and better sound at the exhaust).

Cool. I should be good to go. One 2 1/2" 180 SS mandrel bend, one 3" 90 SS mandrel bend and a 2.5">3" transition almost = price of muffler FTL...:vash:

What did you use? I have been thinking about doing that very thing but have not found any resonated tips yet, that I like, that are small enough to fit. 3" inlet, short body length.

One of these numbers?
Attachment 206531
Attachment 206532

Mine is for a car making at least 300 at the wheels though..I'm not sure anything more than 2.75" is necessary for most MT setups.

Either way, bigger is better for case size. Magnaflows are all straight through so they flow nice, IMO they sound the best, and a bigger case should muffle more.

ansa silverline > *

Thanks. I looked at the Silverline stuff this evening, also Monza. I did not see anything with a 3" inlet, resonated, that would work lengthwise.

I have one from my 3" enthuza package. I know 2 others with 3" and a big Magnaflow and they wish they had my muffler. It sounds similar to the mrz-r motor

I'll make a vid of my car for you this weekend.

Hustler just to be sure are you talking resonator tips or mufflers? I'm looking for a tip I could add to the existing system to make it a little quieter.

How much do resonated tips actually do anyways? I always thought they were just expensive flashy add-ons.

Mine are Ansa 2.5" in 3.5" out, definitely not short. I think the car would be too loud without them. Sounds great with them. Everyone who's been in my car has commented on how awesome the exhaust sounds. :)

muffler. Ask an independent 3rd party...I possibly have the coolest sounding 4-cylinder on earth supported by consistently awesome reactions. Its a touch annoying on road trips, and talking on the cell-phone is a challenge though.

Sir I challenge you to a duel.





....
With my duals.

I challenge you both, with my cowl induction and ported compressor housing. Nyeah.
I like the Ansa tips, they just do not have one with a 3" inlet, and I am not sure I want to run a reducer just for the tip.

I summon johnwag to ready the camera!!!

I would not want to reduce either. I'm sure if you google resonated exhaust tips, you'll find some you like. I did that before...

Yeah I tired the google thing too and I keep turning up the same sources. I am going to try ebay and jeg's next. I already looked at Summit. Monza also has some nice compact tips but do not make one with a 3" inlet.

Ahh, there we go. Hooker, although an old school name, makes one with a 3" inlet. Not sure if 10" will fit lengthwise (that is what she said).
http://www.jegs.com/p/Hooker/744873/10002/-1

3" fence-post out the back of the bumper > faggy ricer-tip shit

Ditto.....and I challenge mine for the best sounding NA in the TDR whore club.
Sounds like a Suby and center dumps.
18 resonator and Borla is your friend! ;)

Chicks dig big tips. Ask your girlfriend about mine.

Kittys do to..... or so I've just read! ;)

There are tons of tips on ebay- find a 3.5" you like, chop it off at the taper so it'll slide over the 3" exhaust and tack it in place.

Well I want a resonating tip that is short, like less than 10" so I can fit it on the existing enthuza tail pipe (cutting it down to the bend) and not have it stick a mile out of the bumper. Those seem to be harder to find.

Ahhh- ok. Yes, I'm in a similar situation - I think with my magna since it's angled and the offset exit hole is very close to the bumper exit. Your's like this?
http://i158.photobucket.com/albums/t...t/IMG_4750.jpg

Yeah pretty much. The muffler is not angled but I do not have much more space to work with than what you show above. So far the Hooker is the only thing I have found in a 3" inlet that comes close to working. The Monza would be even better (it is shorter) but they do not have a 3" inlet option.

Going by buddy's shop shortly.....I'll see what he's got laying around. Might have some options for ya. Who knows?

or maybe a can of spray chrome :giggle:

/\ ;) he he
He's got some resonated tubes that can be sectioned to you desired length and inlet. They aren't tunable, but scrap is scrap.

Thanks I appreciate that. I bought one of the Hooker tips so if that does not work out I'll PM you.

More 3" Enthuza w 3" CAT whoring vids

Thats surprisingly quiet! Nice.

Hustler's car in front of the shop.

Well, the big honkin' Magnaflow showed up today. Boy, this thing isn't about adding lightness to a Miata. Sucker is 24 lbs! But, ther performance should be worth it. Stainless mandrel bends from Columbia River came in yesterday so I have a project for tonight!

Giant Magnaflow MAGNAFLOW MUFFLER 6" X 12" 22" BODY 3" O/O 12578 installed last night. Pretty easy fit. Sounds great wide open, much quieter than the flowmaster at low revs and less rice. TIG'ed it all up to the midpipe with stainless mandrel bends and hangers. Not too bad to install the whole thing at one time. The muffler itself is a heavy sumbitch though. 24 lbs! Pics of the assembly coming tonight.

hustlers car sounds weak lol,





i want you to retort to this comment with launch control vid of you car

i will not be satisfied with anything less from you hustler



edit, naked bitches could satisfy me **drool**

Any spool difference over the flowmaster?

Couldn't tell as it was really wet today and full throttle was FTL. Supposed to dry out and I'm going to log it to compare.

Oh, and this makes 95.6 or 95.8dB so I got banned for the day at the 95dB limited track. How do I kill 3dB?

one of those baffle things that comes on all fart cans from ebay, that could kill 3 db? maybe?

Resonator after cat but before muffler? Mine has one and the whole exhaust is super quiet now with the big muffler. Not sure how much it contributes, though.

Finally got around to posting some pics. Yeah, I know my car is a filty pig.

makes me want to redo my rear section.

and my car still has last week's pollen on it. plus all the seed pods.

TREES HAD SEX ON MY CAR

you're in the right forum for that... hustler? hustler? paging hustler...

sorry, no sympathy here :hustler:

Pretty exhaust Stein. Just too many bends. ;)

Probably the only way he could fit something that big. There isnt much room at ALL under a Miata, though I'm sure you know that.

probably not:
http://i158.photobucket.com/albums/t...t/IMG_4741.jpg

you have the lower rear support behind the diff?

I don't, but I tried to get it high enough of up to add a diy piece.
http://i158.photobucket.com/albums/t...t/IMG_4747.jpg

I dunno... it's pretty effing tight with that support brace. I think I have less than 3/8 of clearance all the way around the pipe. I actually ground off part of the diff housing where it has a corner sticking out just to prevent rattling.

http://gallery.y8s.com/d/234-3/DSC01748.jpg

I still think it's doable. Here's mine- and I wasn't taking that brace into consideration. But there's enough room there to work around it if it was there IMO.