5" exhaust on 04.5 600 (impressions and thoughts)

[bmoeller]

TX Gooseneck, the 5" Dynaflex resonator is GREAT! I had the same problem on my '97. Problem solved. A little deeper tone to. Sounds . I put it just behind the transfer-case.





quote:

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Originally posted by bmoeller

www.iowa80.com Will need to call them up.





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Originally posted by yourdodgeman

I called the company and they gave me both part numbers.



The brand is dynaflex and there part number is 87bc-500-145

and iowa80's part number is 27113



hope this helps



John

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[Vaughn MacKenzie]

TX just something to consider, but the heavy basso of your drone will take a toll on your ears in short order if you're going a lot of miles towing. That sort of frequency and strong dB is the worst on hearing.



I have some drone and added some sound deadening to the doors and back panel but it didn't help a lot (still need to do the floors).



One guy got improved drone results by adding a tailpipe turndown.



You might want to try moving the muffler forward as far as you can.



Good luck, Vaughn

 

[OT-OF-HERE!!]

Originally posted by TX Gooseneck

The stock exhaust measures out at 4".



After driving this thing home last night and to work this morning I don't know. I like sound as much as the next guy, but the drone that comes on at 2000rpm and 70mph is friggen nuts. To the point I was trying to determine some type of supertrap setup to kill the vibration. I'm debating putting a bullet muffler further up stream, possibly after the downpipe.



It vibrates the coins in my ashtray.



Other than that... I like it

Probably the drone has nothing to do with the exhaust but rather drive train vibration. I have a 600 with the stock exhaust and have it and was always curious about the cat being a contributor but recent trips to the dealer and a long discussion with the area service manager from DCX has me pretty convinced the drone is entirely drive train. Guys on this web site and Diesel Truck Resource have had theirs fixed by re-balancing rear and/or front shafts and a couple guys swear it took the trans-case being replaced b-4 that got a fix. That all flows with what the area guy told me and mine is due in this next Thursday as I don't intend to just live with it.

 

[TX Gooseneck]

I had no drone with the stock exhaust. Chasing down sound waves is always fun...

 

[CPritchett]

I put a 5" system on my truck and the drone was terrible so I knocked out the baffle on the muffler that came with the system and put this up front and added a 51" donaldson muffler behind it and it stopped most of the noise. It does not sound great but got rid of 90% of the drone. It still makes a little vibration when pulling a grade with the 5th wheel.

 

[TX Gooseneck]

Originally posted by Vaughn MacKenzie

TX just something to consider, but the heavy basso of your drone will take a toll on your ears in short order if you're going a lot of miles towing. That sort of frequency and strong dB is the worst on hearing.



I have some drone and added some sound deadening to the doors and back panel but it didn't help a lot (still need to do the floors).



One guy got improved drone results by adding a tailpipe turndown.



You might want to try moving the muffler forward as far as you can.



Good luck, Vaughn

In the words of my dad "WHA?"

I plan to dynamat the floor and back of the cab, resonator, and angle iron. Slip some HVAC duct wrap around it?

 

[Forrest Nearing]

man, I heard Sean's truck today... he's got the same exhaust system that I do, but he had the muffler installed backwards. the mufflers on these systems are louvered...



MAN does it make a HUGE difference... now I see why he was complaining about how loud it is! my truck was pretty quiet (by my standards) with the muffler installed correctly



we put a 5" chrome turnout stack on the last portion of the tailpipe and turned it about 45* down/back. he said it narrowed the resoance range considerably.



when he gets back from his next run, we're gonna add some more hangers to keep the pipe itself from resonating so bad. I think that combined w/ some sound deadener, and he'll be a happy camper.



truck sounds good Sean!!! I wish we coulda got an open stretch of road so that I could have actually gotten into boost and put a spankin' on ya



Forrest

 

[TX Gooseneck]

I don't doubt it... I thought you were into it there for a minute and started to feel really good



Bigger turbo bigger injectors and the dance will go smoother.



Really surprised, even my wife noted the reduction in resonnance.

 

[Joseph Donnelly]

5" sounds great, especially outside the truck, but the muffler has to be forward to kill the drone. Actually, you don't kill it but move the rpm range where it is bad. If the muffy is back near the tailpipe, 2000-2300 rpm is terrible. If you move it up closer to the transfer case, 1600-1900 is the bad rpm zone. Since cruising rpm should be 1900-up, move the muffler as far frontward as practical. You can put a second one behind it too.



Unfortunately, clearance is tight for a 5" downpipe, so suppliers generally use a 4" down pipe. But, the downpipe is the part that most needs to be 5" because that is where the gases are hottest and need to expand. So, the usual 5" system is pretty much for the sound, not performance. A true 5" system helps on a 12 valve over about 570 hp, with a big turbo. I expect the later engines will behave similarly.

 

[Jeff_K]

I have the same 5" exhaust and after I straight piped it the drone was pretty bad as well. I had it around 2200 RPM with the straight pipe, So I added a walker resonator as far forward as possible. This cut the drone down, but it also moved it to around 2000rpm. I really like the sound now, but the drone needs to go. It is tolerable while empty, but towing it is really bad. I am going to try to move the resonator back to where the original muffler was and maybe play with some pieces of flex pipe. I also wonder about putting in some 6" pieces of pipe in a couple spots to see if that makes a difference. There has to be some scientific way to figure out how to make this drone go away!

 

[Forrest Nearing]

have you added sound deadener to the interior of the truck? that and some extra stiff exhaust hangers to keep the pipe from resonating is your best bet.



Sean,



I was on it, but my turbo wasn't! (part of my reasoning for twins)



Forrest

 

[doldenburg]

sean, whats your mpg these days? dave

 

[TX Gooseneck]

Dave,



I just hit 40,000 miles - bought the truck in late feb.

I'm averaging high 15's low 16's empty and loaded depends on weight. Heavily loaded isn't great, around 6mpg and with a single Gooseneck around 11. 5-13mpg.

 

[C.Hughes]

i have a 5 inch exhaust and when the VA duration box is turned on 100% you just about have to stay out of it because it drones so bad. you can't have the windows down and be next to a wall are you will just loose you hearing.



somebody please figure something out on this!