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Discussion Starter #1
This past week I was shopping on line for a cat back exhaust when I came across this table on Magnaflow's website:

Magnaflow Technology

It shows the ideal exhaust pipe diameter for a 3.5 liter (213 Cubic Inches) engine producing 250 HP is 2.5 to 3 inches. So I crawled under my SE and measured the pipes from the cats and got 2.5 inches and the same diameter after the y-pipe. So now I'm thinking why change the exhaust all the way up to the cats when all I need to do is change it from the y-pipe back? (Y-pipe included)

So with the addition of some 3 inch pipe here is my solution:

Amazon.com: Magnaflow 10778 Stainless Steel Exhaust Y-Pipe: Automotive

Amazon.com: Magnaflow 13269 XL Stainless Steel 3" Oval Muffler: Automotive

Does this sound plausible or am I going off track?
 

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i believe the stock y pipe is dual 2.25 into a single 2.5 to a muffler and out another 2.5 back to the resonator. check out blastin' bobs y-pipes.

Blastin Bob's Fat Pipes

you might want to find out what they're made from, alumized, t409, or t304
 

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Discussion Starter #3 (Edited)
Blasting Bob's Fat Pipes are definitely not what I'm looking for. I don't need duals these pipes don't include a muffler and they are made of aluminized steel not stainless. Also I leave for work at 5:45 am and while my neighbors aren't the greatest in the world but I don't want to do that to them. My main concern about changing the muffler is noise. I really like the fact the SE is such a quiet highway cruiser and I don't want to screw that up. I'm still considering an electric exhaust cutout so I can have control when I'm generating noise.
 

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optimal for stock or mild mod engine would be 2 and 3/4 single or dual 2" duals. Single 2.5 is a tad too small, dual 2.25 a tad too large. Also if you want good flow and no drone a fully chambered packed muffler like a dynomax superturbo will do it. Any straight through or unpacked muffler will be a little loud to a lot loud. The single magnaflow system is kinda hollow sounding steady state, and that has three mufflers total and the mufflers are off set in / out so the sound wave will hit the side of the internal baffle before it can pass through the muffler which elimiates or minimize the long wave low freq. drone.

Instead of build your own Y pipes, you could use the 17725 dual in dual out:
http://www.dynomax.com/mufflers.php?muffler=superturbo

This is a fully baffled muffler
 

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optimal for stock or mild mod engine would be 2 and 3/4 single or dual 2" duals. Single 2.5 is a tad too small, dual 2.25 a tad too large. Also if you want good flow and no drone a fully chambered packed muffler like a dynomax superturbo will do it. Any straight through or unpacked muffler will be a little loud to a lot loud. The single magnaflow system is kinda hollow sounding steady state, and that has three mufflers total and the mufflers are off set in / out so the sound wave will hit the side of the internal baffle before it can pass through the muffler which elimiates or minimize the long wave low freq. drone.

Instead of build your own Y pipes, you could use the 17725 dual in dual out:
Dynomax® Performance Exhaust | Mufflers | Super Turbo™ Mufflers

This is a fully baffled muffler
The only downside to the Dynomax Superturbo that I can tell is that it's aluminized. I was looking at the Dynomax Ultraflow 17234 just to replace the Flowmaster's muffler and keep cost down, but it's a bit longer than the Flow's 50 series which would force a major cut in the existing Flow's dual out pipes. I found a Magnaflow universal SS 12268 single/dual 2.5 that might work... I'm not sure if it will minimize the low freq drone, but it is packed, which should help. Not much I could do with the 2.5 dual out pipes other than getting rid of the Flowmaster entirely and go cu$tom.:argh:
 

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Dynomax® Performance Exhaust | Mufflers | Ultra Flo™ Welded Mufflers

the ultra flow is a straight through design so it will be loud and depending on the offset won't do much to negate waves, of course I got no idea how the inlet is split to the outlets:scratchhead:


MagnaFlow Exhaust Products - Exhaust Mufflers For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles

is also a straight through design of course once again single in to dual out dunno how the split looks. The center flowmaster that you have is already a chambered but not packed muffler, all in all I'd say for sound control it is really 6 of one vs 1/2 dozen of the other:scratchhead:

The flow master is just painted metal (I know it is thick) or is it SS and / or coated? The dynomax is a much cheaper in construction, I guess the figure the packing is going to be dead in 5 years anyway so who cares if the muffler case will rust out in about that amount of time?

The ultraflow X looks good
http://www.dynomax.com/mufflers.php?muffler=ultraflox

I'd limit it to 2.25 pipe dual in, it has a built in X pipe and run the two flowmaster rear muffler/ resonator tips. I have NO experience with the muffler but looking at the X I would assume it would be harder for long waves to pass through the core as there are two angles to traverse and the center is of the tube will get pulses from the other side.
 

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The ultraflow X looks good
Dynomax® Performance Exhaust | Mufflers | Ultra Flo™ X Mufflers

I'd limit it to 2.25 pipe dual in, it has a built in X pipe and run the two flowmaster rear muffler/ resonator tips. I have NO experience with the muffler but looking at the X I would assume it would be harder for long waves to pass through the core as there are two angles to traverse and the center is of the tube will get pulses from the other side.
I did a little image editing to get an idea what the dyno x would look like:



The only problems I see, is that the flow's rear pipes would have to be cut to fit the dyno x and the system welded in (but clamped at the down tubes.) Overall loudness of the system??? Who knows? Could it be louder than the flow?

Here is the magna:



The magna's straight through, plus the straight feed... I don't know... could that create a really long wave? This could be converted back relatively easier than the dyno x if it didn't work out.
 

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since the flowmaster system is a baffled system, at least on the center muffler, I would be afraid of removing the center baffled flowmaster and installing any straight through muffler.

Are the rear muffler / resonators of the flowmaster system baffled or are they just oval glasspacks? I assume oval glasspacks, as the system has a fully baffled middle muffler.

Now assuming the stock system uses a straight trough center muffler and a baffled rear muffler / resonator. The systems you sketched above with a magnaflow / or ultraflow should sound just like the blastings bob's system.

the superturbo is going to be quite....

Basting bobs is the stock center muffler split to tips for the loudest setup or split to resonators for the quiter setup. The rear Y pipe IMO does a lot in dampening wave as it is an abrupt split in terms of wave propergation.
Blastin Bob's Fat Pipes

Still BB's are not know to be quite, given that it is a single exhaust system with twin tips.

here is a delta flow 50 sound clip, I don't know if has resonators out back
http://www.lxforums.com/board/showthread.php?t=255757

says the 70 has a "mild sound'
http://www.flowmastermufflers.com/shop/index.php?main_page=product_info&cPath=34_158&products_id=3308
 

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Here's a shot of the rear resonators on the Flowmaster:








I got a drawing from Magnaflow so I updated that pic:



So, essentially this would make a, more or less, straight through system. I doubt the packing in the Magnaflow would quite the system much, but who knows?

At this point the Dyno X system looks like the best solution. But, again, it's a one way street. No simple way to revert back.

Question: Would extending the 2.25" downtubes with the addition of the pipes shown in the pic in my last post help low end torque at all? Wouldn't it be similar to having longtube headers?


:scratchhead:
 

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Question: Would extending the 2.25" downtubes with the addition of the pipes shown in the pic in my last post help low end torque at all? Wouldn't it be similar to having longtube headers?

:scratchhead:
don't think so, two 2.25 will not provide more velocity vs a single 2.5".

If you want it quite and chamber and stainless and packed:


MagnaFlow XL Mufflers use an unique combination of large diameter perforated tubing and strategically placed sound baffles to reduce unwanted resonance and help your engine create horsepower.

The sound baffles tune the sound waves using calibrated tuning gate openings that allow portions of the waves to pass through. These tuned waves reflect off the back wall of the muffler and cancel out unwanted harsher sounds.

The large diameter perforated core eliminates the flow restrictions of a louvered style core. A careful balance between perforation size/spacing and the baffle tuning gate make for a great 3 chamber performance muffler.



So this is gonna be much quiter...
Magnaflow XL Turbo Muffler - Magnaflow XL 3 Chamber Mufflers - Magnaflow Turbo Muffler
 
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