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Recently, my dealer did some mods to my exhaust system to eliminate the 55 mph resonance. In the process, they chopped off my 4" custom tips.

Today, I took my C to a muffler shop to have those huge suitcase mufflers chopped off and my tips welded back on. I plan to get the Zoomer cat back system so they would come off anyway and I'm going to the track next week, so I thought this would be a good time to open up the exhaust.

What a surprise when we lifted the car! The resonance mod is a whole new system from the cats back. The suitcases are gone - replaced by small mufflers. The resonators are different as well.

Rather than hack up the system, I decided to wait for Zoomers and headers - then remove the new factory cat back system. Here are some pics:
 

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More dirty pictures

Northern

Thought you might like these spycams too

first and second are Flowmaster on and off the car

3 and 4 a couple of half decent x crossover pipes
 

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Discussion Starter · #5 ·
goddardzilla said:
Northern

Thought you might like these spycams too

first and second are Flowmaster on and off the car

3 and 4 a couple of half decent x crossover pipes
Mmmm, nummy, Zilla.

Are you running the FM's now? The install appears to have no crossover - did you use one? what does the system sound like?
 

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HEMEEE said:
Wow... that's quite different from original!!
I was really surprised by the redesign. I thought they had reworked brakets and perhaps one component.

I have felt a noticable performance improvement with the volant CAI. Maybe the new exhaust is part of the equation?

Also, is this the exhaust that is now standard on the 2006 C? Maybe someone with a 2006 could take a peek up their own skirts.
 

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Complex subject a good exhaust

Northern Rider said:
Mmmm, nummy, Zilla.

Are you running the FM's now? The install appears to have no crossover - did you use one? what does the system sound like?
System is not mine, mine’s still stock. Yes I too noticed apparent lack of X-over; that’s why I showed the x-over pics. It may be a slit cut in each pipe and the pipes welded where they "kiss". I believe retaining the X-over is essential.

NR I hope you don’t mind if I include a bit of background about X-overs and why they work; It’s stuff you’re aware of, however some reading this may find it informative, for those that glaze over reading tech stuff see the last paragraph:

X-overs: All the vehicles I have owned, that I could put a balance or X-pipe on, have responded by giving a big fat torque boost at low RPM. This started with a simple “balance pipe” on 1960 twin cylinder Triumph Bonneville motorcycle; changed from stock separate pipes. The last one was a V-12 Jaguar, every single one showed improvement.

A bit of background: an exhaust gas travels as “slugs” of gas down the ex. pipe. This happens at a very quick pace; at 3000rpm, it occurs at 25 times a second. (One exhaust/scavenge event per cylinder per two crankshaft revolutions). A V8 has 200 gas shots a second. When the exhaust valve closes, the slug briefly slows and partly reverts backwards along the exhaust pipe. Then along comes the next slug of gas after it, pushing along the pipe. A slowed visual would show a series of machine gun-like staccato bursts, finally combining to a smoother but pulsed flow out of the tailpipe.

With an x-over both exhaust pipe runs and mufflers past the x-over are shared. Part of each exhaust pulse goes down the other pipe creating an extra vacuum behind it sucking along the pipe, or “scavenging” the next alternate pulse. It is this scavenging effect adding efficiency that really noticeably boosts the torque.

The effect on system noise is: without a muffler change, the vehicle becomes quieter, probably because with X-over each pipe is then served by 2 mufflers, and also the added “smoothing effect”on the exhaust pulses.

My personal experience using an X-over with after-cat performance-type mufflers and resonators: the sound has been most pleasing, though with V8s the X-over did eliminate some of the aggressive V8 “exhaust lope” at idle.

Of course with the 300c MDS joins the mix and exhaust drone must be taken into account, when enough aftermarket systems are installed a poll would be in order: noticeable power increase, sound at idle, lack of drone, overall positive or negative, etc. If you design your own you may be redesigning MDS drone into the exhaust, as shown by an excerpt from a Magnum Hemi forum thread "The Magnaflow setup I made with just two mufflers in the center, and tips in rear was way too loud on the highway. You can hear the exhaust, and it sounds kinda strange when it kicks into 4 cylinder."

While we are on the subject I notice that the Magnaflow factory system contains a resonator that they say contains a “TruX crossover pipe” I would love to see the insides. Note the Magnaflw tips are right on the mufflers so you will see the mufflers from the rear. Yes NR pictures of a stock 2006 exhaust system to compare would be interesting too.

So retain an x-over (more torque) - Something to think about.

Zilla

More pics: some more x-over pipes - and Magnaflow with Tru-x resonator
 

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Northern Rider said:
Today, I took my C to a muffler shop to have those huge suitcase mufflers chopped off and my tips welded back on.
For those who have done this mod (just removing the suitcase muffler) what has been the result? I have been contemplating having it removed and replaced by straight pipes. Does it drone at all while cruising? Any other issues? I am going to have to take the C in to the dealer also because the factory exhaust is hitting under the right rear floor pan and making a tapping noise.

Joey Molnar
05 Silver 300C
14.0 @ 99
01 Dak R/T
13.7 @ 98
 

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In all it's naked glory

For those who would like to see what a stock system looks like ......... and a cutaway of a muffler.

Click on pic
 

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I thought the suitcase was that flat jobber in the middle, mine is like yours NR, the new design is that spring clamp on the left comming off the center suitcase. No matter, my Zoomer is on a UPS truck and going to the shop on 6/20 7:30 am.
 

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Kind of funny, my Export 300C (built 11.2004) has the same stock exhaust but the tubes from the central muffler to the suitcases are painted (or powdercoated) black.

Only for Export?
 

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Better crossover

Here's a representation of the SRT8 exhaust looking from underneath. If it's accurate it looks as if there is a better designed x-over than the 300c. Any SRT8 owner care to comment?



Zilla
 

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