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Old 08-23-2011, 08:48 PM   #1
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Need info on Muffler & Air Filter

1998 36 MDSS
The service center near us tells us we need a muffler, but they don't know where to get one for our coach. Anyone know who sells these?

We have also heard that NAPA have a replacement air filter that can be ordered; does anyone know the stock number for it?
Thanks
Linda
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Old 08-23-2011, 09:42 PM   #2
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NAPA Air Filter

Linda
Our 1999 coach uses the NAPA filter #6644, which was available @ the Seattle NAPA store. I order a muffler NEL 86542M, (Ryder part # 3044048)from Ryder Fleetproducts.comand had it in 2 days. They have muffler clamps in the std u bolt and the stainless steel band style.
Dave
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Old 08-23-2011, 11:45 PM   #3
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Linda,
Cummins has the air filter for a much lower cost than Napa.
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Old 08-25-2011, 02:39 PM   #4
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Hello Linda:

When I replaced my muffler on my 2001 I had an Aero Muffler 4040 installed. It is much smaller than stock. From inside I cannot tell the difference in sound and it is only slightly louder than stock. The Aero Muffler did increase my boost from about 22 lbs to 24 lbs just by changing the muffler. I am glad I did change to a more efficient muffler. It is also less expensive than a stock replacement.
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Old 08-25-2011, 03:22 PM   #5
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Dave makes a good point about the aero turbine muffler for a replacement. I would also advise that exhaust pipe leading to the muffler be replaced also. That pipe in the elbow gets very thin from the heat and water. Awhile back I posted pictures of the installation on this forum.

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Old 09-01-2011, 12:40 AM   #6
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Try filterbarn.com and compare prices, they sell fleetguard which is the brand cummins recommends. I don't like NAPA filters, personal choice. Now it's been about 10 years ago, but there was a great oil/air filter study done, and the OEM filters did a better job than any of the aftermarket ones, the exception was Purolator filters air and oil was as good as the OEM's for less money. I change the Air every other year. The coach never gets the 15k miles cummins say is the oil change miliage interval so that happens in the driveway every July along with the genset.
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