Quiet 5.0

[KGrGunMan]

I've been watching a lot of 5.0 dyno runs and I have a friend with a '13 5.0 with some exhaust work and wow these can get loud at full revs. Most of all, I want my exhaust to make good power (and still be legal in nazi-california) but after power, If it just sounded stock, I'd find that ideal.

Is it even worth modifying the exhaust on the 5.0 for power if I don't care about the sound?

With some other cars I've seen good weight reductions going from huge mufflers to lighter mufflers, but I'm unfamiliar with the 5.0 exhaust system.

Is a lighter weight, more powerful, stock sound volume/quiet exhaust a feasible goal with a 5.0?

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[B-Fox]

I think the current cars already used 2.5" pipe, except in one area where they kicked up over the rear axle, I forget what it was called but the pipes were kind of pinched down, IIRC simply removing that restriction found a good amount of power, if you wanted to go further you could bolt on a set of gt500 mufflers that flowed better but weren't obnoxiously loud.

We're going to have to wait until people get their hands on these to see where the restrictions are and what can be done.

The premium models may be able to change the diffuser and swap to GT350 mufflers for an improvement, but there's also that new crossover chamber in the mid-pipe now that could hinder performance, maybe we can cut it out and put in an X or H pipe.

 

[Grimace427]

Axle backs reduce weight significantly and improve sound, but don't add any power. Catbacks add very little in terms of power as well, less than 10rwhp. The main areas for improvement are removing the cats and adding headers, both greatly increase the volume of the exhaust. You can leave the stock mufflers with cat deletes or longtubes but they sound very tinny and generally not very good.

 

[Tim Hilliard]

I think the current cars already used 2.5" pipe, except in one area where they kicked up over the rear axle, I forget what it was called but the pipes were kind of pinched down, IIRC simply removing that restriction found a good amount of power, if you wanted to go further you could bolt on a set of gt500 mufflers that flowed better but weren't obnoxiously loud.

We're going to have to wait until people get their hands on these to see where the restrictions are and what can be done.

The premium models may be able to change the diffuser and swap to GT350 mufflers for an improvement, but there's also that new crossover chamber in the mid-pipe now that could hinder performance, maybe we can cut it out and put in an X or H pipe.

The flattened pipe has a minimal effect on flow, the surfaces of a pipe are the slowest flowing area so a flat spot is only restricting low velocity gases, if the flat spots are done properly they can actually be utilized to create gas acceleration creating some minor scavenging effect.

The reason cat backs show improvement is more likely due to the mufflers that come in the kit and not the mandrel bent, non dimpled(flattened) pipes.

I think the chambered muffler is on the EcoBoost, not the 5.0. It's purpose is to make the car not sound like crap.

Also this car has IRS so I assume the exhaust is routed under the axle so it will likely be dimpled for clearance just like the '03 IRS cars were. If I remember that correctly.

 

[Tim Hilliard]

Axle backs reduce weight significantly and improve sound, but don't add any power. Catbacks add very little in terms of power as well, less than 10rwhp. The main areas for improvement are removing the cats and adding headers, both greatly increase the volume of the exhaust. You can leave the stock mufflers with cat deletes or longtubes but they sound very tinny and generally not very good.

^^^Yes
In the case of a 5.0 you are removing weight from the wrong end but it's still removing weight.

 

[oj5OH]

Axle backs reduce weight significantly and improve sound, but don't add any power. Catbacks add very little in terms of power as well, less than 10rwhp. The main areas for improvement are removing the cats and adding headers, both greatly increase the volume of the exhaust. You can leave the stock mufflers with cat deletes or longtubes but they sound very tinny and generally not very good.

I was planning on taking the car to my local muffler shop for a simple muffler delete. If the pipes that are going to go in place of the mufflers aren't installed correctly or if the correct pipe isn't used, could that possibly restrict flow? Or should I just wait to see what the aftermarket brings to the table and pick something? I don't know too much about the details behind that.

 

[B-Fox]

I'm starting to think Tim hunts me around this forum trying to discredit every thing I say, I'll try harder to shut up from now on..

although, from what I remember the chamber has been spied under test mules equipped with 5.0L's since we where on TMS and this site didn't exist.

 

[Tim Hilliard]

I'm starting to think Tim hunts me around this forum trying to discredit every thing I say, I'll try harder to shut up from now on..

although, from what I remember the chamber has been spied under test mules equipped with 5.0L's since we where on TMS and this site didn't exist.

LOL Sorry, I was trying to find the posts where they showed the EcoBoost exhaust with that huge chamber, and it was confusing which one was which. I hope they don't have anything like that on the 5.0. SVT site had the pictures I think. I respond randomly, you're not special ;) I didn't mean to discredit you, you made some valid points, I haven't seen my car yet, I don't know. I look at things from a different perspective, doesn't mean I'm right, ever.

You know what they say about opinions....

 

[Brent302]

LOL Sorry, I was trying to find the posts where they showed the EcoBoost exhaust with that huge chamber, and it was confusing which one was which. I hope they don't have anything like that on the 5.0. SVT site had the pictures I think. I respond randomly, you're not special ;) I didn't mean to discredit you, you made some valid points, I haven't seen my car yet, I don't know. I look at things from a different perspective, doesn't mean I'm right, ever.

You know what they say about opinions....

You know they may do it like the original Challengers. The R/T with Automatic had a giant suit case muffler in the center. The manuals had two bottle straight throughs... Yes the Challenger is a mid muffler. Those two giant growths at the end are Resonators....yes resonators. (Trust me it was a huge debate finally settled by Dodge lol)

Auto (Big Suitcase)

Manual (Bottles)

Anyways my main point is the Automatics have the giant suitcase to help with drone. Auto compared to manual the manual sounded more aggressive.

 

[KGrGunMan]

Thanks all, I'm just trying to pick out the best low hanging performance fruit for a basic parts upgrade. It's looking like an intake, quietest cat back I can find and a tune should do me fine for the easy/cheaper performance gains, then a short shifter and move onto the suspension.

 

[B-Fox]

a lot of aftermarket intakes seem to open up the filter to hot engine bay air

 

[Tim Hilliard]

I'm starting to think Tim hunts me around this forum trying to discredit every thing I say, I'll try harder to shut up from now on..

although, from what I remember the chamber has been spied under test mules equipped with 5.0L's since we where on TMS and this site didn't exist.

And you sir are correct Big Ass Chamber Muffler

All the cars are getting that massive chambered muffler. Now I know that an X-Pipe might be in order. The good news is it appears the exhaust made it front to back without too many crimps and dimples so a mid pipe and mufflers will make changes easy. All you need is some band clamps and a sawz-all

 

[Grimace427]

The flattened pipe has a minimal effect on flow

If you were talking about the factory resonators in the overaxle pipes, the flat parts actually don't cut into the inner pipe diameter at all. I cut my resonators out and they are straight though with no inner change in diameter.

I was planning on taking the car to my local muffler shop for a simple muffler delete. If the pipes that are going to go in place of the mufflers aren't installed correctly or if the correct pipe isn't used, could that possibly restrict flow? Or should I just wait to see what the aftermarket brings to the table and pick something? I don't know too much about the details behind that.

The back end of the exhaust has minimal effect on flow. Exhaust gasses have the most energy right as they exit the engine. Once they've passed the headers, cats and to the crossover pipe, changes to the rest of the exhaust have minimal effect on total engine power output (within reason) because the gasses have lost most of it's (heat) energy and (kinetic) velocity.

I personally don't like the sound of muffler deletes, too blatty and unrefined IMO. I've become a huge Borla fan. Their S-Types are the best muffler for the Coyote I've ever heard.

...although, from what I remember the chamber has been spied under test mules equipped with 5.0L's since we where on TMS and this site didn't exist.

Ford has a patent for a dual-inlet/dual-outlet crossover/muffler thing and it appeared on the GT at the Barrett Jackson auction.

Thanks all, I'm just trying to pick out the best low hanging performance fruit for a basic parts upgrade. It's looking like an intake, quietest cat back I can find and a tune should do me fine for the easy/cheaper performance gains, then a short shifter and move onto the suspension.

Tune is basically the only 'low hanging fruit' you are going to find. Headers/cat deletes will release the most power for the N/A applications, followed by an aggressive intake manifold like the Boss or CJ. Both of those avenues have their issues though. Cat deletes and headers cause issues passing emissions, O2 sensor issues, and tuning issues. Aggressive intake manifolds shift the powerband into the upper RPM's at the expense of low end torque.

 

[Brent302]

And you sir are correct http://www.svtperformance.com/?attachment_id=3132

All the cars are getting that massive chambered muffler. Now I know that an X-Pipe might be in order. The good news is it appears the exhaust made it front to back without too many crimps and dimples so a mid pipe and mufflers will make changes easy. All you need is some band clamps and a sawz-all

I still think it will differentiate Manual vs Auto. This was the DIB GT at Barrett Jackson.

 

[Tim Hilliard]

I still think it will differentiate Manual vs Auto. This was the DIB GT at Barrett Jackson.

See this is why I get pissed, so much different info. Then the question becomes is that just a car for the auction they built or how it will come off the line. I guess I will just wait to crawl under mine.

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