Use muffler as Y?

[Daedalus]

Would those universal single input to dual output mufflers work as a Y pipe for our cars? Do they flow well enough?

 

Say you use a magnaflow muffler, like this: http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=8085 and drop it in the mid pipe. The two outputs would just extend to the rear of the car and with some tips on the, exit under the bumper. (only a single large muffler instead of two smaller ones)

 

Is this a dumb idea?

[black318i]

I though about this and I don't think flow would be an issue, but I decided it would be more unnecessary work and cost more.

[F-WDC Spec B]

Agreed. Most light SUV use the design your speaking of but they use 3in inlet and 2.5 outlet or even 3 in outlet. but then you need the bend the piple around the rear axles. the thing is there isnt enough space under the car to fit the muffler.

[cfdrumr]

there is plenty of space to fit a muffler next to the drive shaft...ive done and and so have others...

if you are not positive on what you are STATING, dont say it

[F-WDC Spec B]

#1 i am positive in what im saying

#2 you have a wagon so you have a lil more room

#3 and from my friends doing a similar set up on their car (not lgt) they had to get a small muffler that acutally constricted flow.

 

So yes i am positive on what im saying. but if im wrong a just let me know. dont be an ass...

[cfdrumr]

there is no difference in the area near the drive shaft on wagon or sedan. If your planning on throwing the muffler behind the rear axle like the new STI/5door wrx, then no...it wont fit.

 

If you want to put a full size can where most people put a resonator, it will fit just fine. I DONT THINK you can run 2 pipes from there back, but I know u can fit a can.

 

The only thing I can think of is maybe the Spec.B angel moved the driveshaft?

[F-WDC Spec B]

If you want to put a full size can where most people put a resonator, it will fit just fine. I DONT THINK you can run 2 pipes from there back, but I know u can fit a can.

That i wasnt thinking of, if you use a round can like a cherry bomb then i can see it. and i agree bout the two pipe but if you place it just before the y or use custom y's it could work.

 

The only thing I can think of is maybe the Spec.B angel moved the driveshaft?

 

its the same.

[cfdrumr]

no its not...the spec b is built in its own factory and the cars are massaged and given beer a la Kobe Beef

[black318i]

There is room for a medium size muffler under there. The stock resonator is huge, but somewhat thin on one side. The thing is I'd much rather run a single 3 around the diff and axle and make my own Y than run two 2.5's. Also I could use the money i saved my not having to purchase 2 mandrel bent 2.5" pipes to purchase a prefab Y to make things even easier.

[GEE-OTTO]

hahahah ppl saying it wont fit have never looked under our cars that is a great idea and extra work WTF is he talking about ?? Anyway sounds like a good idea cheaper b/c you only need one muffler and bending two pipes will work around the axles

[Daedalus]

Thanks for the replies guys. So from what I'm reading, that they muffler will fit, but the issue is getting 2 pipes past the axles instead of one? I wasn't aware that the stock Y was after the axles.

 

I was also considering using a borla.

40670 3" 2 1/4" 19" x 4" x 9 1/2" Center/Dual $290.99

http://www.borla.com/images/xr1_turboxl_diagram.gif

 

It's a lot smaller than the Magnaflow and the outlet pipes are down to the proper 2.25".

 

I wonder if it would reduce sound enough? I mean a lot of systems use 1 muffler (for the STI and WRX) and they sound great (especially the borlas). There's also the question of whether it'll need a resonator or not.

 

The Borla I posted above is from their Turbo XL series. Anyone know how they are designed and whether they flow well? From the diagram they look like straight through (save for the internal Y split) designs.

[Daedalus]

I was looking at Resonators on Vibrant's website, they also have universal mufflers. Anyone know how they sound?

 

EDIT: Found this. Hope I could get the LGT to sound that mellow.

 

[ame=http://www.youtube.com/watch?v=TpHM0iPQHA8]YouTube - Subaru Impreza WRX STI Vibrant Exhaust[/ame]

[GEE-OTTO]

Thanks for the replies guys. So from what I'm reading, that they muffler will fit, but the issue is getting 2 pipes past the axles instead of one? I wasn't aware that the stock Y was after the axles.

 

I was also considering using a borla.

40670 3" 2 1/4" 19" x 4" x 9 1/2" Center/Dual $290.99

http://www.borla.com/images/xr1_turboxl_diagram.gif

 

It's a lot smaller than the Magnaflow and the outlet pipes are down to the proper 2.25".

 

I wonder if it would reduce sound enough? I mean a lot of systems use 1 muffler (for the STI and WRX) and they sound great (especially the borlas). There's also the question of whether it'll need a resonator or not.

 

The Borla I posted above is from their Turbo XL series. Anyone know how they are designed and whether they flow well? From the diagram they look like straight through (save for the internal Y split) designs.

 

Thank you so much the Y is before the rear diff housing two pipes can easily be bent around the rear axle housing and that muffler will fit better than the blimp in place now. If that thing can fit ANY muffler can with room to spare i was looking at using a Dynamax Welded series 3" in dual 2.25" out with two tail pipes bent to stock locations But I got a really good deal on two Magna Flows $50 for two from a user on here but i would like to try it to see how it would sound

[Daedalus]

Looks like Vibrant also makes two 3" to dual 2.5" universals. One is 20" overall and the other is 25". I wonder what the interior design of those are. They claim a "Straight Through Design" for their StreetPower series of mufflers.

 

http://vibrantperformance.com/catalog/product_info.php?cPath=1021_1031_1053_1110&products_id=35

 

http://vibrantperformance.com/catalog/product_info.php?cPath=1021_1031_1053_1110&products_id=57

[GEE-OTTO]

if you get that setup def make a clip I think two pipes dumping out under the rear would sound very nice

[black318i]

Thanks for the replies guys. So from what I'm reading, that they muffler will fit, but the issue is getting 2 pipes past the axles instead of one? I wasn't aware that the stock Y was after the axles.

 

I was also considering using a borla.

40670 3" 2 1/4" 19" x 4" x 9 1/2" Center/Dual $290.99

http://www.borla.com/images/xr1_turboxl_diagram.gif

 

It's a lot smaller than the Magnaflow and the outlet pipes are down to the proper 2.25".

 

I wonder if it would reduce sound enough? I mean a lot of systems use 1 muffler (for the STI and WRX) and they sound great (especially the borlas). There's also the question of whether it'll need a resonator or not.

 

The Borla I posted above is from their Turbo XL series. Anyone know how they are designed and whether they flow well? From the diagram they look like straight through (save for the internal Y split) designs.

 

It's not that 2 pipes can't go around the diff it's just more work. I was thinking I may do this though so I can run 2 resonators and try to keep things quiet.

 

Thank you so much the Y is before the rear diff housing two pipes can easily be bent around the rear axle housing and that muffler will fit better than the blimp in place now. If that thing can fit ANY muffler can with room to spare i was looking at using a Dynamax Welded series 3" in dual 2.25" out with two tail pipes bent to stock locations But I got a really good deal on two Magna Flows $50 for two from a user on here but i would like to try it to see how it would sound

 

The Y is after the diff and no I wouldn't say any muffler will fit for two reasons. 1. the stock resonator I believe is about 18" long and mufflers can be much larger than that. 2. the stock resonator is thin on one side so it can clear the body. You are most likely going to loose some ground clearance even with a 4" thick body.

[Daedalus]

Yeah, I'm starting to think that space will be an issue. Mainly trying to squeeze a resonator and a muffler in the mid pipe. The mid pipe isn't as long as I had hoped. It also has that bend right before the Y (to go around the rear diff i presume). Reduces a lot of room in there. Def room for one muffler or resonator, but prob not both.

 

Probably just as well to get to rear cans and do it the way the Subaru engineers designed it.

 

Theres also the question of exhaust hangers. How many are there in the mid/Y area? Are there enough to hold the weight of a bigger muffler AND resonator?

[Daedalus]

It's not that 2 pipes can't go around the diff it's just more work. I was thinking I may do this though so I can run 2 resonators and try to keep things quiet.

 

Are there any issues running the resonator after the muffler? I've never seen that before and am curious why that is? Is it just because people usually put mufflers as close to the exit as possible and then the most logical place for the resonator is somewhere in the middle?

 

Curious how a 3" to 2.5" dual to 2 2.5" Ultra Quiet resonators would sound.

[black318i]

I don't think it matters. I see a lot of SUV's with stock exhausts that have resonators right there at the rear bumper. I was thinking 3" into two 2.5" glasspacks and 2 2.25 mufflers. Here is some info I found

 

The results in HP order:

1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq

2.Bassani Real Street 373.7 hp/ 333.8 tq

3.Hooker Maxflow 373.5 hp/ 333 tq

4.Borla XS 373.3 hp/ 332.6 tq

5.Magnaflow 372.8 hp/ 332.5 tq

6.MAC 372.3 hp / 331.5 tq

7.Flowtech Afterburner 372.3 hp/ 330.1 tq

8.Hooker Aerochamber 372.1 hp/ 330.4 tq

9.Bassani 372 hp/ 333.5 tq

10.Spintech 371.6 hp/ 332.2 tq

11.Edelbrock Performer RPM 370.9 hp / 331.3 tq

12.Borla XR1 370 hp/ 334 tq

13.Flowtech Terminator 369.5 hp / 331.3 tq

14.Dynomax Ultra Flo 369.4 hp/ 333.2 tq

15.Flowmaster 369.4 hp / 331.8 tq

16.Flowtech Warlock 366.3 hp / 325.3 tq

17.No muffs 365.2 hp / 330.1 tq

 

Sound Off in Quietest to Loudest (Decibels):

 

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.

2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.

3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.

4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.

5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.

6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.

7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.

8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.

9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.

10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).

11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.

12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.

13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.

14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.

15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.

16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

 

And I have listed here a muffler shootout test done by CAR CRAFT, they show the best bang for the buck, and show the db's

 

The Mufflers

MAKE MODEL Part No. COST

SUMMIT Turbo 630125 $14.75

THRUSH Magnum Glasspack 24214 $16.50

THRUSH Boss Turbo 17718 $23.95

HOOKER Competition 21006 $25.95

DYNOMAX Super Turbo 17733 $28.50

DYNOMAX Race Magnum 24215 $31.95

HOOKER Super Competition 21106 $35.95

SUMMIT Fully Welded 630325 $38.69

FLOWTECH Afterburner 50322 $39.95

 

MUFFLER FLOW TEST

 

MUFFLER Flow at 28-in H20

DynoMax Race Magnum 528.64 cfm

Thrush Magnum Glasspack 507.40 cfm

Summit Fully Welded 343.38 cfm

Flowtech Afterburner 342.20 cfm

DynoMax Super Turbo 333.94 cfm

Hooker Competition 232.46 cfm

Hooker Super Competition 320.96 cfm

Summit Turbo 331.16 cfm

Thrush Boss Turbo 297.36 cfm

 

MUFFLER Idle dB WOT dB

DynoMax Super Turbo 89 123

DynoMax Race Magnum 94 133

Flowtech Afterburner 92 124

Hooker Competion 92 122

Hooker Super Competion 90 125

Summit Turbo 89 124

Summit Fully Welded 92 125

Thrush Boss Turbo 90 123

Thrush Magnum Glasspack 92 128

 

DYNO TEST

All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.

 

 

MUFFLER HP TORQUE 2,500-6,000rpm Average

Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft

Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft

DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft

Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft

Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft

Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft

DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft

Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft

Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft

 

All tests via an independent lab

All tests @ 15” wc

 

2 “ Straight Pipe 283 CFM

2 ¼ “ Straight Pipe 365 CFM

2 ½ “ Straight Pipe 521 CFM

 

2 ¼” Typical Bent tailpipe 268 CFM

2 ½” Typical Bent Tailpipe 417 CFM

 

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM

2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM

Same as above set for reverse flow 141 CFM

2 ¼” Cherry Bomb 239 CFM

2 ½” Cherry Bomb 294 CFM

 

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM

2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM

2 ½” Inlet/Outlet Gibson Superflow 267 CFM

2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM

2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM

2 ¼” Inlet/Outlet Thrush CVX 260 CFM

2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM

2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM

2 ½” Inlet/Outlet Hooker Max Flow 521 CFM

2 ½” Inlet/Outlet Borla Turbo 373 CFM

2 1/2" Inlet/Outlet Magnaflow 284 CFM

[Daedalus]

Wow, Borla seems to kick some ass when it comes to HP and Flow. Anyone know the difference between their Turbo and XS(pro?) mufflers?

[itsme]

I was going to try that then I went the 3 muffler route and my car is pretty quiet. Their is not much room under their for a big muffler. http://i167.photobucket.com/albums/u156/itsmebryan/175521.jpghttp://i167.photobucket.com/albums/u156/itsmebryan/175529.jpg What are you looking for in sound? I have sound clips if you want to hear.

[black318i]

I'm looking to keep things fairly quiet. Is that 3"-2 2.5" and what mufflers are you using? If you can post sound clips that would be great.

[Daedalus]

itsme, is that a full 3" system, or does go down to 2.5" after the Y?

 

Sound clips and details (what cans you used) would be awesome!

[itsme]

Since those pictures I had the y moved back and it's 3" and splits to 2.5" . I running a 3" Borla XR-1 as resonator and dual magnaflow mufflers and magnaflow tips. http://i167.photobucket.com/albums/u156/itsmebryan/175849.jpg

http://i167.photobucket.com/albums/u156/itsmebryan/124755.jpg

 

Here is the sound clips:

Outside

[ame=http://www.youtube.com/watch?v=xYZylyOu89Q]YouTube - MOV042[/ame]

inside

[ame=http://www.youtube.com/watch?v=6lnBvn2yLVs]YouTube - inside windows up[/ame]

WOT windows up

[ame=http://www.youtube.com/watch?v=zytE1zVugl4]YouTube - WOT win up[/ame]

WOT windows down

[ame=http://www.youtube.com/watch?v=8QKjligVH-I]YouTube - wot win dn[/ame]

 

I don't think that having 3 mufflers causes a problem with making power. I'm hit about 340whp on 91 cali and 371whp on e85 and hit 20psi @ 3400rpms and hold @20psi to 7000 rpms.

[cfdrumr]

Bryan...thanks for doing those clips! I love the way your wagon sounds...

do you happen to know the part number of the borla? I cant find anyone of the XR1 that look like yours.