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Old 01-06-2012, 10:38 AM
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2000 7.3

I have a 2000 f250 completely stock with a 6637 filter. No gauges so I can't check boost pressure yet. If I'm pretty heavy on the throttle and it shifts there is a really loud whooshing noise. Is this normal or did I have a boost leak somewhere. Also the fuel mileage is not good only around 10 mpg regardless of how it's driven.
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Old 01-06-2012, 11:34 AM
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The whoosh is the nature of the beast with a 6637. Does the truck still have a CAT/Muffler?
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Old 01-06-2012, 11:38 AM
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Doesn't look like it ever had a cat but yes it still has the stock muffler
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Old 01-06-2012, 01:53 PM
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Yup, I heard the whoose sound as soon as I put on the 6637, love it.

If you still have the stock muf you should consider the Walker BTM muffler
which is direct flow, meaning a through and through channel as big or bigger than the diameter of the pipe. You can drop a baseball though it and love it's sound too; throaty but not raw like a straight pipe plus it will pass inspection in muffler required states.

The stock muffler is on the par with the stock box filter and both of those together don't amount to cr@p as far as letting your engine breath.
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Old 01-06-2012, 01:59 PM
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I'm also a fan of the whistle and woosh just wasn't sure if it was normal during a shift. I'm just gonna straight pipe it when money allows I just picked this thing up. And wanted to get all the basics, and Maintenance items out of the way first
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