Magnaflow: true dual glass packs or dual exit muffler?
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Joined: Mar 2015
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Magnaflow: true dual glass packs or dual exit muffler?
Just in need of suggestions for my next exhaust system when my stock muffler rusts out (it's about 70% of the way there) on an 04 5.4 liter f-150. So as the title says, should I go with the true dual magnaflow glass packs (2.5" coming off of an x pipe). Or go with the basic single entry magnaflow muffler with dual exits? Costs would be about identical as far as parts and labor go for both so I'm not worried about that. I just want to know what you guys think about each setup and maybe some pros and cons. Thanks!
Oh and here are the parts I'm talking about just for reference.
Glass packs: part no. 13123
Not sure which muffler I'd go with, so I'd appreciate some suggestions on that too!
Oh and here are the parts I'm talking about just for reference.
Glass packs: part no. 13123
Not sure which muffler I'd go with, so I'd appreciate some suggestions on that too!
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Joined: Jun 2010
Posts: 510
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From: Holt, MO
I always put true duals on mine when I do them. I am old school like that. To me a single in dual is sort of a fake way to make duals. I would just make them true with either an H or X pipe and you will be happy.
I did 2.5" duals on my 2004 5.4 truck, felt sluggish with the extremely open exhaust. I ran a 3" midpipe to single round muffler, with a Y pipe on the muffler outlet giving me 2.5" dual tailpipes. Sounds just as good and feels stronger than the 2.5" duals did on my 2004 did. I say replace with a single muffler, replace the entire midpipe if needed and go 3" if you do. Very happy with my system.
The blue truck has true duals with Dynomax Bullets, same system my '04 had.
Thorough exhaust video.
Inside sound clip.
The blue truck has true duals with Dynomax Bullets, same system my '04 had.
Thorough exhaust video.
Inside sound clip.
Yep, truck is tuned on 89 octane. Increased the performance, engine runs better, and mpg is better. I don't know why Ford didn't program them this way. I usually average 15mpg with the 295/60-20s.
Senior Member
Joined: Dec 2006
Posts: 43,542
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From: Joplin MO
Ford didn't tune it that way for the following reasons:
1. They have to allow for production variances, engines on the "wrong" side have to perform adequately.
2. They have to tune for 87 octane, along with a cushion for variances, also accounting for 85 octane mountain gas and operation at high altitudes.
3. They have to do the same thing for emissions, all engines have to pass out of the factory and for 80k miles afterwards with nothing but "required" scheduled maintenance.
Of course custom tuning will improve everything. However - what specific tunes you have for your engine will not necessarily work well in someone else's engine.
1. They have to allow for production variances, engines on the "wrong" side have to perform adequately.
2. They have to tune for 87 octane, along with a cushion for variances, also accounting for 85 octane mountain gas and operation at high altitudes.
3. They have to do the same thing for emissions, all engines have to pass out of the factory and for 80k miles afterwards with nothing but "required" scheduled maintenance.
Of course custom tuning will improve everything. However - what specific tunes you have for your engine will not necessarily work well in someone else's engine.
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Joined: Sep 2015
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From: South Carolina
Thats great for gas mileage. Im getting some 305/65 18s put on sometime this week and I know my MPG will suffer going from my current 275/70 18s. gotta look into getting it tuned
Ford didn't tune it that way for the following reasons:
1. They have to allow for production variances, engines on the "wrong" side have to perform adequately.
2. They have to tune for 87 octane, along with a cushion for variances, also accounting for 85 octane mountain gas and operation at high altitudes.
3. They have to do the same thing for emissions, all engines have to pass out of the factory and for 80k miles afterwards with nothing but "required" scheduled maintenance.
Of course custom tuning will improve everything. However - what specific tunes you have for your engine will not necessarily work well in someone else's engine.
1. They have to allow for production variances, engines on the "wrong" side have to perform adequately.
2. They have to tune for 87 octane, along with a cushion for variances, also accounting for 85 octane mountain gas and operation at high altitudes.
3. They have to do the same thing for emissions, all engines have to pass out of the factory and for 80k miles afterwards with nothing but "required" scheduled maintenance.
Of course custom tuning will improve everything. However - what specific tunes you have for your engine will not necessarily work well in someone else's engine.
There tuner won't be a miracle worker, but it will wake the truck up. Don't expect it to gain you 2mpg or anything. It will help but will hardly pay for itself.
