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Magnaflow is advertising a cat-back Expedition exhaust. Single, side exit. Doesn't exist?
-- Chuck

Nobody is requiring you to post a reply you know. Maybe it was missed when a search was doneOnly works on the Non-EL. The EL version is under development. Does anybody do a search anymore?
Nobody is requiring you to post a reply you know. Maybe it was missed when a search was done
When this was discussed before I think the consensus was to have exhaust shop replace factory muffler with aftermarket, remove little muffler under rear bumper and weld in some straight pipe with a new tip.
The $$$ savings over going with the Magnaflow kit would be huge and performance would probably be the same.
Magnaflow is advertising a cat-back Expedition exhaust. Single, side exit. Doesn't exist?

You’re right. There are no gains to be made power wise. A cat back is strictly to add sound.I'm an 'old' guy, hot rodding in the 60's kinda guy. I'm at a loss to understand what the advantage is to a "cat back" exhaust system. Isn't the catalytic converter the real power robber in the first place? What's left to tune once you get the exhaust out of the cat?
I remember putting on custom exhaust manifolds, as straight a pipe as possible, and a muffler that only looked like a muffler but did very little muffling - ha.![]()
This only applies to the 15+ models with the EB.

On the EcoBoost motors, the muffler is actually a huge power-robber. Properly designed cat-backs have made gains of up to 100 hp and 200 lbs-ft on the dyno (F-150, no one has dynoed gains on the Expedition that I’ve found). Not all of them do, obviously, but the potential is there. When Ford put the EB motor in trucks, they made them as quiet as possible partly because people wanted the V8 sound, not the V6 one. This cost plenty of power.
Modern cats are nowhere near as restrictive as they used to be, and the EB uses two small ones instead of a big single one. There are still gains to be made, but they actually aren’t as significant as the rest of the exhaust is.
This only applies to the 15+ models with the EB. The V8s are different and don’t see anywhere close to as big of a difference with exhaust mods.
You can’t really make the V6 sound as good.
I really hope nobody believes that changing a $60 muffler will give them an additional 110 horsepower.