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noise from flowmaster american thunder exhaust

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Old 01-02-2013, 07:19 PM   #1
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noise from flowmaster american thunder exhaust

I got a flowmaster american thunder exhaust. A friend recomended it and they are very pleased with it, as iam i. Except lately, aboutt 2 months after it being professionally installed, there id a noise coming from under my passenger seat, which is where my exhaust runs under the truck. It is a rattling noise that happens only when i accelerate slowly, and my rpm's are around 1700-1900. Right before it shifts. Then the noise goes away when i rev it or completely let off the gas. Any ideas? any help is apprieciated, cannot figure this out, thanks!
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Old 01-02-2013, 07:20 PM   #2
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check the bolts, i have the same sound.
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Old 01-03-2013, 04:40 AM   #3
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Smile noise

check the tail pipe near the rear of the leaf spring. mine is making contact there under light throttle and a right turn. fitment issue which cannot be adjusted.
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Old 01-07-2013, 12:13 AM   #4
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Alll good suggestions......may I add 1 more?

Mine was found while the truck was cold.....smacked the cat shield and heard the same rattle....traced it to a pebble/rock inside the cat shield.

I also had the tail end of the pipe making contact with part of the rear frame iirc but it was only on bumps.

The small pebble/rock incident caused an annoying rattle at low rpm tho.

Get under the truck with a glove and start thumping on parts on the exhaust and trace the sound if possible.

Sometimes flowmasters do rust from the inside out tho.......hopefully that's not the case for you.
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Old 01-07-2013, 06:12 AM   #5
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Check the bolts and ALL your clamps.

If your setup is strictly held together with clamps (out of the box) - things may have shifted over time and are 'settling in' (so to speak).

I had mine welded at the clamps after we installed it.
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Old 01-07-2013, 06:14 AM   #6
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Quote:
Originally Posted by Justus View Post

Sometimes flowmasters do rust from the inside out tho.......hopefully that's not the case for you.
It shouldn't rust after only 2 months.

But I will agree with you..... Mine has rusted out (holes) at the muffler out feed pipes after 4 years. This week I'm getting it removed and going back to a stock setup.
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