3" mbrp downpipe noise - Ford Powerstroke Diesel Forum
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Old 11-18-2012, 09:22 AM
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3" mbrp downpipe noise

Ok so I cut out the factory cat and muffler a few weeks ago and absolutely loved it, so I figured I would step it up the other day and I ordered the 3" mbrp downpipe from xdp (which showed up in 2 days with free shipping). I was all excited to get it in so I did it yesterday and started the truck and am not to sure how I feel about it. It has a very bad vibration only at idle, which I assume it's hitting the fire wall. But even driving the truck it's extemely loud in the cab is this normal? It sounds like I'm runnin no exhaust...I expected a little more noise but not this much. Any feedback is appreciated

Thanks , matt

Last edited by ThatKidsF350; 11-18-2012 at 10:11 AM.
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Old 11-18-2012, 10:28 AM
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a lot of guys have fitment issues with MBRP down pipes. it may be rubbing the cab. also make sure the band clamp on the turbo is completely sealed. sometimes if your not careful it will open up on the bottom but look good at the top.
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Old 11-18-2012, 10:35 AM
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U might have to beat the firewall back a little to prevent it touching the dp.
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Old 11-18-2012, 10:36 AM
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It is definitely hitting the pinch weld on firewall. I had that issue on my 95. I was ready to put the stocker back on before I found the issue. Sounded like the turbo was eating itself when it was making the noise.
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Old 11-18-2012, 10:40 AM
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Yes! I'm on my way home from a trip up north right now and I have my radio cranked so I don't have to listen to it...I was considering putting the stock one back in to. I'm going to look at the pinch weld and band clamp as soon as I get home...thanks guys
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Old 11-18-2012, 11:38 AM
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Did u just put it in, or did u do all the cuttin and prying already and just not enough
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Old 11-18-2012, 11:57 AM
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I just put it in then realized how bad it was soo I started prying no cutting but the prying didn't really do anything to stop the noise...I also heated the downpipe and tweaked it alittle
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Old 11-18-2012, 12:16 PM
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You won't have to do anything with the pipe but cut the pinch weld and beat the section flat against firewall. If you have a port-a-power, you can get a block of wood in there and use it to bend the pinch weld back.
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Old 11-19-2012, 10:00 AM
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That pinch weld has to be cut out.... i used a digging bar and a block of wood to bend it out if the way.
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Old 11-21-2012, 04:44 PM
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Same here,
I had the cut the pinch welds and hammer it flat. Then I started the truck and heard a vibration. It was clearing the firewall, but with engine movement, it rubbed against the firewall just a bit. I had a long prybar and a hammer to make some more room.
My truck is a 5 speeds, so it has even less space than an auto.
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