3" Exhaust + 5.4L 2V

**dchawk81** · 10-20-2014, 12:51 AM

As I was crawling under my vehicle to change differential fluids I noticed my muffler is on its way out. I'm not about to try to patch a new one in so I'll just do a cat-back like on the Escort. It's way easier.

That makes me ask if it's worth a 3" exhaust now since I found one that I think I like at a reasonable price. I know it won't be 3" the whole way back because of the cats so is there any point or should I just stick with stock?

Oh and no I'm definitely not doing headers. It has stock manifolds on it.

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BTW if it's already 3" you can ignore my idiocy. It just doesn't look like 3 to me.

**RhinoZ24** · 10-20-2014, 08:33 AM

I believe the pipe is all 2 1/2" at least it was for mine and they don't change it much.

Dodge Sucks, Chevy Swallows, Toyota's the Turd

**dchawk81** · 10-21-2014, 05:29 AM

I found a Walker parts diagram. It does seem to be 2.5" based on the clamps.

I'm considering this setup:

http://www.amazon.com/dp/B000JTJ47W/..._cyJrub1ZBH4W5

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Bet I'll end up saying "screwit" and putting a cheaper, more stock-ish set on.

**5pointSlo** · 10-22-2014, 04:22 AM

2.5 would be just fine. Even if there is a 3" available I wouldn't use it. Everyone seems to think that you always want ad minimal back pressure as possible but that isn't always the case. With zero back pressure your exhaust actually creates a lot of turbulence which can ultimately hurt your HP numbers. Without some type of forced induction to counter it, its worthless. However using the right diameter pipe, the small back pressure created, along with the resonance of the pipe, work together to sort of pull the exhaust gases in one steady direction, improving flow.. Sorry about the rant, just a little FYI.

**dchawk81** · 10-22-2014, 04:26 AM

No problem and thanks for the input. That's why I posted the thread.

**dchawk81** · 10-24-2014, 05:45 AM

I can piece together a similar setup as I put on my Escort for $188 plus tax. Same series muffler (Walker Quiet Flow SS) and aluminized steel piping. I might go that way instead. I'd rather do all stainless but I can't seem to find the piping.

**dchawk81** · 10-24-2014, 08:59 PM

I'm finding almost nothing but 3" in the stainless systems. Nothing OEM size seems to be manufactured in the better steel.

The Magnaflow 15608 is pricey but 3" and stainless from the cat back. As well as being mandrel bent. It also doesn't sound too loud based on the two YouTube videos I found on a 5.4 Expedition.

I'm a bit torn...buy the cheaper setup and be almost stock sound but deal with a lower quality pipe or spend on a truly smooth, all stainless but slightly louder (debatable) and fatter system?

**Jersey_Joe** · 10-25-2014, 10:35 AM

Originally Posted by dchawk81

I'm finding almost nothing but 3" in the stainless systems. Nothing OEM size seems to be manufactured in the better steel. The Magnaflow 15608 is pricey but 3" and stainless from the cat back. As well as being mandrel bent. It also doesn't sound too loud based on the two YouTube videos I found on a 5.4 Expedition. I'm a bit torn...buy the cheaper setup and be almost stock sound but deal with a lower quality pipe or spend on a truly smooth, all stainless but slightly louder (debatable) and fatter system?

Magnaflow. Really isn't that loud. Just enough to know its there. It's really not that bad. But besides that. They make a great product that they stand behind. I would go with the magnaflow

**RhinoZ24** · 10-25-2014, 07:26 PM

Originally Posted by Joe Grasso

Magnaflow. Really isn't that loud. Just enough to know its there. It's really not that bad. But besides that. They make a great product that they stand behind. I would go with the magnaflow

^X2 it's not a Flowmaster so you won't go deaf lol.

Dodge Sucks, Chevy Swallows, Toyota's the Turd

**dchawk81** · 10-25-2014, 08:47 PM

That's the impression I got from the videos. It seemed like you only really hear it when he stood on the pedal. Otherwise it's mellow or even silent. My exhaust isn't exactly silent from outside the vehicle when I rev it up, but I can't hear it in the vehicle.

I'd get a Quiet Flow SS muffler like I have on the Escort if I could just find the damned piping in stainless. That sucker is SUPER quiet.

Short of OEM stainless piping, it looks like I will save my pennies and get the Magnaflow. The warranty is appealing. At 194k on the Navigator, it's just being broken in.

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