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Discussion Starter · #1 ·
OK guys, I was looking at the underside of my car the other day when I was fixing one of my mudflaps. I saw that true dual exhaust would be really easy to make happen. It looks like it would only take about 10 feet of pipe and maybe 2-3 hours of work with proper tools. It looks like there's definitely room for another section of pipe right beside the one that's currently there which could feed the right half of the engine's 3 cylinders. Is a true dual exhaust something that would be a good idea or would it be a waste of time in comparison to the factory exhaust that's already there? In comparison to a cat back, would a true dual system help the vehicle perform MORE or LESS? The mufflers obviously will be changed, but I want to kick a** in silence, so I really don't want anything louder than Flowmaster 60's.

In the future, XCal with CAI and Eibach springs will happen. I want to save the XCal for last to see if I can get a great tune. I PM'ed one person on the board with this question, but I wanted some opinions from the group.
 

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Well, I'm not entirely sure how much back pressure the v6 needs. But, If i where to personally do this myself here's what I'd do. I replace the existing pipe with 2"(max) pipe and add another next to it. I'd also install an H pipe early on in the system. I'd personally use a cambered muffler, but not sure which one.
 

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Discussion Starter · #4 ·
Mason, you don't think my mileage would go to crap by doing that? I'm worried that I might throw all kinds of codes, but if I do this after I install my SCT and CAI, I can probably readjust some things to make things come back again. I just hope that won't SLOW ME DOWN instead of make me faster (which is kind of the point of doing all of this anyway).

These would be great - I'm not too sure how Ford will like it though if I were ever to have a problem with the engine of the car (since I got a VERY extended bumper to bumper warranty). I figure the Duratec 30 and Aisin tranny can handle a lot. So, I just might do Eibach's first, followed by the SCT and CAI, and then last the exhaust.
 

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[quote author=thereisnospoon link=topic=86064.msg1640563#msg1640563 date=1187147938]
So, I just might do Eibach's first, followed by the SCT and CAI, and then last the exhaust.
[/quote]

Or you can have a one of a kind exhaust and take pictures and show us all. Plus, the added volume of the intake will like to escape with a better exhaust. More fuel at full throttle and higher revs before shifting with the sct, that's when the exhaust would be nice. Oh yea, and the sound too ;)

Add on, have you done research to know how much it would cost to do this? What about exhaust tips?
 

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[quote author=thereisnospoon link=topic=86064.msg1640563#msg1640563 date=1187147938]
Mason, you don't think my mileage would go to crap by doing that? I'm worried that I might throw all kinds of codes, but if I do this after I install my SCT and CAI, I can probably readjust some things to make things come back again. I just hope that won't SLOW ME DOWN instead of make me faster (which is kind of the point of doing all of this anyway).

These would be great - I'm not too sure how Ford will like it though if I were ever to have a problem with the engine of the car (since I got a VERY extended bumper to bumper warranty). I figure the Duratec 30 and Aisin tranny can handle a lot. So, I just might do Eibach's first, followed by the SCT and CAI, and then last the exhaust.
[/quote]

They have MIL eliminators that connect into where the o2 sensors would go, this would eliminate CEL's and MFC's that would adversely affect your performance, it's not street legal but if you don't care about that it shouldn't matter. also the headers if I'm not mistaken come with the return bungs to hook up any egr crap that might come off the exhaust (if any) so that loop shouldn't be affected. I would put some type of muffler on it to deaden sound for noise ordinance laws that could affect your local area. But to my knowledge the only thing I'd be concerned with is getting the tune done after all is completed, I'd keep the stock setup too just in case you need it for warranty purposes. that way they can't give you crap about any little thing you come in for that's engine related. If I'm not mistakened, if you go with a custom tune that would void the warranty anyways (I could be wrong but don't think I am). hope that answers your questions, have a good one.
 

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Will those even fit? The chassis has a few differences between the Mazda-spec and the Fusion...they may not "bolt on" without some issues. Personally, I hope they do, but I would expect that they would have been marketed toward the Fusion if they did (that way, those companies can double their profits by simply advertising 'they fit Fusion's too!') Maybe someone with a shop and time can look into that, like Jusnes or Steeda.

Of note: Those MSDS headers still Y into one pipe, which it seems would bolt nicely to the Magnaflow setup if they fit Fusions, but is not a true dual...is there enough room for two flex pipes?

Adding a full exhaust can take away from low-end torque, making you a bit slower off the line, but adds mid-range torque and high-end HP (making you faster on the freeway)

Someone needs to take nice under-body shots around the trans cradle so we can see what we have to work with. Anyone out there with a lift and a camera care to snap a few shots?

I had some custom exhaust work done on a 2000 Ford Focus that ran me $500...Depends on the piping you choose: Steel, aluminized steel, T405 stainless, T304 stainless (like Borla), Titanium, etc... going from cheapest to most expensive. In Illinois, I recommend Twisted Pipes in the town of Ringwood:

Twisted Pipes
5211 mann dr
ringwood il 60072
shop number is 815-653-3300
 

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Discussion Starter · #8 ·
[quote author=seawolf link=topic=86064.msg1641645#msg1641645 date=1187193336]
Of note: Those MSDS headers still Y into one pipe, which it seems would bolt nicely to the Magnaflow setup if they fit Fusions, but is not a true dual...is there enough room for two flex pipes?
[/quote]

See, I don't know - I'm going to have to research that. I'm headed to the dealership right now to get a friend of mine who is going to be doing some electrical work for someone else today - might take my digicam and see if I can get back on the floor and snap some photos of a Fusion up in the air.

Adding a full exhaust can take away from low-end torque, making you a bit slower off the line, but adds mid-range torque and high-end HP (making you faster on the freeway)
See, this is why I think having the Magnaflow might be more beneficial than true duals - having that one little restriction seems to matter big time with takeoff.

Someone needs to take nice under-body shots around the trans cradle so we can see what we have to work with. Anyone out there with a lift and a camera care to snap a few shots?
Let me see what I can do.
 

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Discussion Starter · #9 ·
Well, I wasn't able to get those pictures, but looking at the underside of my car I think there is definitely room for two pipes. The main restriction seems to occur at the front of the vehicle, but after that it seems relatively wide open.
 

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That sounds promising... :)
 

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[quote author=seawolf link=topic=86064.msg1641645#msg1641645 date=1187193336]
Will those even fit? The chassis has a few differences between the Mazda-spec and the Fusion...they may not "bolt on" without some issues. Personally, I hope they do, but I would expect that they would have been marketed toward the Fusion if they did (that way, those companies can double their profits by simply advertising 'they fit Fusion's too!') Maybe someone with a shop and time can look into that, like Jusnes or Steeda.

Of note: Those MSDS headers still Y into one pipe, which it seems would bolt nicely to the Magnaflow setup if they fit Fusions, but is not a true dual...is there enough room for two flex pipes?

Adding a full exhaust can take away from low-end torque, making you a bit slower off the line, but adds mid-range torque and high-end HP (making you faster on the freeway)

Someone needs to take nice under-body shots around the trans cradle so we can see what we have to work with. Anyone out there with a lift and a camera care to snap a few shots?

I had some custom exhaust work done on a 2000 Ford Focus that ran me $500...Depends on the piping you choose: Steel, aluminized steel, T405 stainless, T304 stainless (like Borla), Titanium, etc... going from cheapest to most expensive. In Illinois, I recommend Twisted Pipes in the town of Ringwood:

Twisted Pipes
5211 mann dr
ringwood il 60072
shop number is 815-653-3300
[/quote]

Shorty HO816 Mazda6 V6 Headers will fit but Y-pipe will not, you would have to do custom piping from the header exit all the way back. using mil eliminator with custom tune would be best setup for CEL elimination. Also, h-piping the dual setup will eliminate uneven tq between banks and it'll quite it down a little. I can take pics once I get back. I'll take detailed pics when I'm doing the Catback I bought from steeda. That won't be until November though.
 
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