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Discussion Starter · #1 · (Edited)
For all those intersted here is a pictoral to explain what is exactly inside:

REAR MUFFLER

Here is a picture showing the tube diameters and changes in pipe sizes. (Red represents flow and direction.)


Here is a picture showing the inlet side internals of the rear muffler.


Here is a picture showing the outlet side intetnals of the rear muffler.


In the MagnaFlow SRT8 system, all the neck downs and pipe size reductions are removed and higher flowing 3" is used both for pipe and muffler internal. TRUE 3" flow is maintained throughout the entire system.

**ALL IMAGES ARE COPYRIGHT Car Sound / MagnaFlow Performance Exhaust**
 

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Discussion Starter · #3 · (Edited)
INLET PIPES

Here is a picture showing the tube diameters and changes in pipe sizes. (Colors represents flow and direction.)

In the MagnaFlow HEMI system, all the neck downs and pipe size reductions are removed and higher flowing 2.5" is used both for pipe and muffler internal. TRUE 2.5" flow is maintained throughout the entire system.

**ALL IMAGES ARE COPYRIGHT Car Sound / MagnaFlow Performance Exhaust**
 

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Appears to be more of a resonator than a muffler. The 'choke down' areas are what appear to be providing the 'back pressure' points. Under full throttle I do not see the 'muffler' as the real point of restriction, but rather the turns and changes in pipe diameters.

THe real point for many 'after market' exhaust buyers is sound. When you think about it DCX & GM have worked with performace engineers for over 10 yrs to build exhaust systems that have good performance, while staying with the EPA and state guidelines for sound and DB levels. Gains from adding exhausts have not been as great on 'high performance cars' with such factory installed exhausts. (Example: Z06 Vettes... Vipers... etc.)

Bottom line: There is room for improvement, but you need to decide what you want. If is it sound... then an after-market exhaust can provide that. If it is performance, then you need to weigh the $$$$ - Gain ratio and see if there are better ways to spend the money.
 

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Discussion Starter · #8 ·
JBS11 said:
Appears to be more of a resonator than a muffler. The 'choke down' areas are what appear to be providing the 'back pressure' points. Under full throttle I do not see the 'muffler' as the real point of restriction, but rather the turns and changes in pipe diameters.

THe real point for many 'after market' exhaust buyers is sound. When you think about it DCX & GM have worked with performace engineers for over 10 yrs to build exhaust systems that have good performance, while staying with the EPA and state guidelines for sound and DB levels. Gains from adding exhausts have not been as great on 'high performance cars' with such factory installed exhausts. (Example: Z06 Vettes... Vipers... etc.)

Bottom line: There is room for improvement, but you need to decide what you want. If is it sound... then an after-market exhaust can provide that. If it is performance, then you need to weigh the $$$$ - Gain ratio and see if there are better ways to spend the money.
Im not so sure what is cost effective for you but our SRT-8 system is good for nearly 20 RWHP and makes torque everywhere. For a market price of 600-700 (not sure what the actual price will be) I cant see that as "expensive HP."

The mid body muffler is the restrictor .. images wil be up on Monday. You can see the post i have done for the standard Hemi 300C and you wil lfind the path is not so free as you think.
 

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If you compare the pictures of the stock 300C rear "mufflers" that you posted in the other thread, you can
see that the stock 300C has alot more turns and twists to the exhaust flow than the
SRT8 version, which is just about straight thru.

I bet that frees up some ponies for the SRT8!!

Thanks for taking the time and effort in tearing the mufflers apart and posting
the pictures!! It really does help see how restrictive our stock exhaust systems
really are!!

Jim
 

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Discussion Starter · #11 ·
CJ7VFR said:
If you compare the pictures of the stock 300C rear "mufflers" that you posted in the other thread, you can
see that the stock 300C has alot more turns and twists to the exhaust flow than the
SRT8 version, which is just about straight thru.

I bet that frees up some ponies for the SRT8!!

Thanks for taking the time and effort in tearing the mufflers apart and posting
the pictures!! It really does help see how restrictive our stock exhaust systems
really are!!

Jim
Not a problem ... I am a huge car enthusiast as well and you can just try and keep me from tearing things open ... not gonna happen.

Still somewht curious to see what an SRT8 cat-back would do on a 300C hemi .. hmmmm

Richard
 

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vtlfed1500, thx for the great info. My question is this........Would it be possible to remove the suitcase mid-muffler on the SRT 8 and replace it with straight pipes. This way the resonators are gone, but the mufflers are still intact at the rear of the car. Would this sound any good? Would it affect power in a negative way? Just wondering if this would be a cheap alternative to getting more sound out of the car. Thx.
 

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Discussion Starter · #13 ·
Johnny Vig said:
vtlfed1500, thx for the great info. My question is this........Would it be possible to remove the suitcase mid-muffler on the SRT 8 and replace it with straight pipes. This way the resonators are gone, but the mufflers are still intact at the rear of the car. Would this sound any good? Would it affect power in a negative way? Just wondering if this would be a cheaop alternative to getting more sound out of the car. Thx.
From my reading here i woudl have to assume that the rear resonators would prove to be the best components to replace BUT this may introduce more cabin noise. The mid body muffler does most of the silencing.
 

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Discussion Starter · #15 · (Edited)
TLM said:
Has anyone put a SRT8 cat-back on a 300C? Would it be worth it?
I don't think you would see any appreciable gains with the aftermarket peice we offer BUT the stock one seems an intersting venture. With the aftermarket piece you would intorduce more noise and with the 3" pipes and te MDS would drive you nuts.
 

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Im not so sure what is cost effective for you but our SRT-8 system is good for nearly 20 RWHP and makes torque everywhere. For a market price of 600-700 (not sure what the actual price will be) I cant see that as "expensive HP."

The mid body muffler is the restrictor .. images wil be up on Monday. You can see the post i have done for the standard Hemi 300C and you wil lfind the path is not so free as you think.
Thank you very much for your impressive writeup - even for noobs like me, those diagrams make it easier for me to understand.

20 RWHP is very impressive! Did this horsepower jump take place in conjunction with any other mods, a CAI for example, or just a stock vehicle producing 20+ RWHP after the exhaust mod?

Also, will this exhaust system be a problem when turning the car back in on a lease? Probably a question for my service manager...

Thanks,
Tim
 
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