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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 11-20-2011, 03:33 PM
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Default Exhaust Q's

Hello all,

I know there is "no such thing as a dumb question", but that doesn't hide the fact I feel silly not knowing anyways....

My 2011 CC Outdoorsman has a single exhaust. I have very little mechanical knowledge and would have someone do the work for me. I like the sound of the Magnaflow duals and wonder if I would gain anything other than sound from transitioning to a single in dual out. If so, would I need the infamous y-pipe? I will likely go with the 24 as I will be moving to Maine where the restrictions do not allow anything other than OEM sound... that will be about as close as I can get without the extra restriction of the OEM style.

Thanks for bearing with my ignorance! I've learned alot from posts here and I'm sure I will learn more!
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Old 11-20-2011, 08:26 PM
wbowyer wbowyer is offline
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I had the single outlet on my truck and put on the magnaflow kit. I did notice a good bit of get up and go and the truck just all around runs better. I also put on a heavy duty rear bumper (and front to match) which has the exhaust cut outs. However, there is a significant difference in sound, not obnoxious enough to get pulled over but a cop could hit you if he wants to be a pain.
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Old 11-20-2011, 10:01 PM
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whether you have single or dual it will basically have equal performance. The key is going with a good free flowing muffler and ditching the oem one. The y pipe swap would only help.
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Old 11-24-2011, 03:15 PM
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When I was scouting around lookin for exhausts, I found myself at a place in Fresno, and the owner, who was extremely helpful, recommended Aero Turbine over his own self designed exhaust. I do have the sport hemi, so the duals out the back. The Aero is single in, single out, so he fabricated a y-pipe, installed it all in about...45 minutes for 180 bucks. Was extremely happy, and to this day i love the sound, absolutely love the sound. And did notice a small performance increase.


(first post, btw, PUMPED!)
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Old 11-24-2011, 03:29 PM
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You should gain a little HP and a combined with a good intake you will definitely see some mpg increase. If you are getting the muffler, while they are down there definitely get the Y pipe installed. The stock y is very constrictive.
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Old 11-25-2011, 12:56 AM
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So, the stock muffler (and also the y-pipe) is very restrictive? I have a 2011 Ram Crew Cab 4X4 with the dual pipes. Personally, I think it sounds great, but if I can get better response and better mpg, I'm all for that!
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Old 11-25-2011, 01:08 AM
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the duals are 3" into two 2.5 inches, it has to breathe better, it is sold as stock by Dodge
toss in a K&N air filter for better air flow, sold by Dodge & parts stores
& a magnaflow Y pipe, just less restriction

How would a smog shop or a cop know the difference ?

police are listening for LOUD exhaust, not a better breathing one
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Old 11-25-2011, 01:54 AM
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Replace the Y pipe as the stocker is kinda squished and restrictive.

If you have a single in/single out system now, you can have dual look by going to a single in / dual out system.

The biggest gain will be going to a freer flowing muffler.
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Old 11-25-2011, 02:47 AM
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Thanks to all for the responses! Been a couple of days since I've been on here. I really appreciate it!
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Old 11-25-2011, 12:46 PM
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Quote:
Originally Posted by MADDOG View Post
Replace the Y pipe as the stocker is kinda squished and restrictive.

If you have a single in/single out system now, you can have dual look by going to a single in / dual out system.

The biggest gain will be going to a freer flowing muffler.
MD, my Edelbrock tubular header system on my 383 Chevy has exactly the same right/left exhaust bank junction system at the "collector" as our hemi has. I've seen a pair of similar complete system header units with exactly the same design. Now, the headers systems that I would classify as actual racing headers just have separate right/left exhaust banks with totally separate piping or an X-junction. I know there are all manner of systems out there for all kinds of exceptions, but many of the quality aftermarket header 2-into-1 collector systems have the same kind of "half moon" adaptation at the collector...which is usually a 3" pipe for many of the street systems.

I claim no knowledge on this whatsoever, but seeing this Y-pipe design on many quality aftermarket systems makes me think it's perhaps not as restrictive as we think...at least for general street performance on a closer-to-stock engine. Edelbrock even had a classification of 450 horsepower as a ceiling for my headers. And yes, I realize that's getting close to our hemi's with an exhaust, intake, and programmer mod.
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