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Old Jul 3, 2008 | 04:28 PM
  #1  
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From: beer city usa
Muffler

I want to replace the original muffler on my 1997 expedition 5.4

I went to auto zone and the guy there sold me a flow master 50 series delta flow. Telling me it was what I would want.

When I opened up the box that muffler wasnt listed in the book for my vehicle.

Should I use this muffler is there a better choice does it even matter? I saw a 50 series SUV muffler and what not.


I could sure use some advice from the knowledgeable group here thanks!
 
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Old Jul 3, 2008 | 07:52 PM
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The FM50 Delta Flow will work fine. I would have gotten the FM50 SUV due to the larger capacity, but its no big deal.
 
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Old Jul 3, 2008 | 08:58 PM
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From: beer city usa
What difference would the capacity size make?
 
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Old Jul 4, 2008 | 08:48 AM
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The FM50 SUV has more capacity and anti drone chambers. The chambers will cancel out any drone and some harsher noises. Generally larger capacity mufflers are recommended for towing, heavy loads and large engines. The capacity helps maintain a constant sound output and not get too loud.
 
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Old Jul 4, 2008 | 10:21 AM
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Thanks for the information. Makes me wonder if flowmaster would even warranty the f50 delta flow? I may just need to call up flow master.
 
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Old Jul 4, 2008 | 11:07 AM
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The delta flow will work fine. As for the warrenty it only cover defects in workmanship. Your flowmaster will likely rust through before you have any other issues with it. You can help the muffler last a little longer by brushing off the old rust a paint from time to time and painting it with some ceramic header paint.
 
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Old Jul 5, 2008 | 02:27 PM
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From: beer city usa
sounds good im going to give it a go. Thanks a ton for your advice and information I truely appreciate it.
 
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Old Jul 6, 2008 | 09:16 AM
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Warranty or not, even in costal areas, Flowmasters often last 7 years or more. What are the chances you will still have the truck by then?
 
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Old Jul 6, 2008 | 01:55 PM
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How long the muffler lasts will depend on location and driving habits. Trip Duration) There were guys on here that had FM70 and FM50 mufflers only last them 3 winters. One guy was from Mass the other guy was from UP Mich. I expect my FM to last more than 5 years. A warrenty is something I'm rarely concerned about. Try to collect on a warrenty from some companies and they will tell you to go pound sand even if the part meets their warrenty requirements.
 
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Old Jul 6, 2008 | 02:29 PM
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From: beer city usa
My only thought on warranty was that it would somehow fail because it wasnt listed for my vehicle and then would not be covered.

At any rate I put the thing on and it worked out really nice. If you want a little aggressive sound that wont be a bother on highway trips and the like this thing fits the bill. Some nice sound on acceleration without any drone. However if you want some monster truck aggro sound this isnt the ticket!

Thanks again for everyones advice..
 
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Old Jul 6, 2008 | 04:43 PM
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No worries on the warrenty. The muffler is fine for your application.
 
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