Would either of the Magnaflow mufflers be a good fit?

[dandingo]

I know, I know. This should be in the exhaust section but no one really goes there. I've asked a few questions there with minimal responses.

Anyway, I've been looking for a Magnaflow dual-in dual-out and found a few that might work. I wanted to know if anyone's running them or if anyone knows if they'll be an easy weld by a muffler shop?

Also, one's 2.25 and one's 2.5. I wasn't sure which would be better?

http://www.justmagnaflow.com/cgi-bin/shopper.exe?preadd=action&key=CARS11385

http://www.justmagnaflow.com/cgi-bin/shopper.exe?preadd=action&key=CARS11386

Thanks for everyone's help!

[SynSyx]

i cant answer your question but im in the exact same boat as you, so ill def be following along

[trashcop 80s 80s]

I have a Magnaflow single in, dual out. 2.5 inch without a cat. With a mostly stock M20, it is loud, but very mean sounding. I don't know the muffler's part number, but it fit in the stock muffler area very well. It has two metal hooks welded to it for the stock mounting points.

[z31maniac]

Dual 2.5" exhaust on an M20 would be a bit large I would think.

[E30_fiend]

Seeing as i exhaust is a measly 2 inches, the best weld on muffler would be the smaller inlet diameter one. And by the way, you don't need a dual in dual out muffler. Single in works just fine with a "y" pipe. That's what I did with my first attempt at exhaust. It wasn't loud enough, so I piped it 2.5 all the way back. Frees up a little more space and makes it sound mean as hell. 2.5 is a little large though. Every once in a while I'll get a few back fires. But I'll deal with that. Its a small price to pay for it to sound good.

Back on subject, find a muffler with the tip or tips you like and don't worry about how many inlets it has. Even if it had a 3" inlet to the muffler, you could still realistically mount it with a "y" pipe. You would just need the dual part of the y to be 2.25 and the single part of the y to be 3 inches.

So just find something you like. A good muffler shop can do anything you need.


E30_Fiend

[E30_fiend]

Dual 2.5" exhaust on an M20 would be a bit large I would think.

I think he means he has single 2.5" piping all the way back with no cat to a single in DUAL out muffler.


E30_Fiend

[z31maniac]

^Possibly, but in the original post he did say dual in dual out.

[E30_fiend]

^Possibly, but in the original post he did say dual in dual out.

If it was 2.5 dual in the the new muffler would just have to slide over the stock exhaust. It IS a little big though. You're right. Unless he is piping new exhaust then 2.25 would be the way to go.


E30_Fiend

[T Verdier]

i have 2.5 dual in dual out with no cat it sounds kinda shitty and kinda racy at the same time. when i first start driving it sounds hella raspy and shity even down low but when it gets hot it s only raspy above 4k and sounds beafy

[dandingo]

Seeing as i exhaust is a measly 2 inches, the best weld on muffler would be the smaller inlet diameter one. And by the way, you don't need a dual in dual out muffler. Single in works just fine with a "y" pipe. That's what I did with my first attempt at exhaust. It wasn't loud enough, so I piped it 2.5 all the way back. Frees up a little more space and makes it sound mean as hell. 2.5 is a little large though. Every once in a while I'll get a few back fires. But I'll deal with that. Its a small price to pay for it to sound good.

Back on subject, find a muffler with the tip or tips you like and don't worry about how many inlets it has. Even if it had a 3" inlet to the muffler, you could still realistically mount it with a "y" pipe. You would just need the dual part of the y to be 2.25 and the single part of the y to be 3 inches.

So just find something you like. A good muffler shop can do anything you need.


E30_Fiend

I wasn't sure what size the original piping is. That's why I posted both 2.25 and 2.5. I really wouldn't mind getting a single in with a Y-pipe, I just wasn't sure if it would be restrictive?? That's my main concern. I don't want to lose any HP or fuel economy just for sound.

And I do have a cat. Everything's stock, I just wanted a muffler.

[E30_fiend]

I ran a y for almost a year and had no problems. Noticed a difference in top end. Now I have a y at the exhaust manifolds and 2.5 all the way back. Its a nice setup. I have some I.E. long tube headers waiting to be installed.


E30_Fiend

[dandingo]

I ran a y for almost a year and had no problems. Noticed a difference in top end. Now I have a y at the exhaust manifolds and 2.5 all the way back. Its a nice setup. I have some I.E. long tube headers waiting to be installed.


E30_Fiend

I'm guessing it was a bad difference? So you lost a little power in the top end?

[dandingo]

Anyone have any idea if the 2.25 would work if I brought it to my muffler shop and had them weld it up? I just want to make sure the stock piping will line up with the inlets on the muffler since they look a little wide.

[SynSyx]

Anyone have any idea if the 2.25 would work if I brought it to my muffler shop and had them weld it up? I just want to make sure the stock piping will line up with the inlets on the muffler since they look a little wide.

bump, i need the answer to this question as well

[Emre]

Stock exhaust line diameter for a regular 325 is: 1.75" x2. So, even a dual 2" input muffler is a tiny bit big and will need some fabrication to fit properly and work well. Dual 2.5" is way too big.

To guys who think "bigger is better," remember that these are not f/i cars. With an n/a engine, intake and exhaust length, diameter, and tuning is critical. You need a diameter that's large enough to flow well, but narrow enough to promote good exhaust gas speeds (remember Bernouli's principle). Similarly, the total length of the intake-exhaust tract (from intake to exhaust tip) is just as important. As for a cross-over pipe, the placement is critical on an I6 engine: you need the exhaust pulses to be out-of-phase with each other.

You can't just use any tube diameter you want and stick a y-pipe anywhere you feel like it.