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Old 04-17-2021, 04:18 PM   #1
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Will 7 inches be enough?

Title was a cheap way to get attention.

I just picked up a rock tamer from Goodwill for $40.00. When mounted on my hitch of my 2500 GMC gasser the passenger side flap is 7 inches from the end of my tailpipe. I seen that there can be an issue with a diesel exhaust being too close, will I be in the same situation? Iíve just put it on to check fitting, clearance , etc. But having second thoughts after measuring the tailpipe to flap. Iíll go to plan B which I havenít researched yet, of changing the tailpipe to vent out the side rather than back. Any real life experience appreciated.
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Old 04-17-2021, 04:25 PM   #2
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I thought this was a family forum....<clutches pearls>
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Old 04-17-2021, 05:46 PM   #3
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I would go to an exhaust shop and have the pipe moved to the side. I did that on my Duramax so there would be no problem. Cost me $30.
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Old 04-17-2021, 07:32 PM   #4
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My tail pipe turns to the side.
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Old 04-18-2021, 09:11 AM   #5
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Yep, have the tail pipe turned - have seen tamers with exhaust screens but I would have the pipe turned to the side
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Old 04-18-2021, 10:52 AM   #6
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I took a straight edge ruler and went around the tailpipe inline with the length axis and marked the mud flap. I used a scroll saw to cut out the elliptical exhaust opening. That was years ago and nothing has borne since then.
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Old 04-18-2021, 07:33 PM   #7
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I think you want to do something. Mine is about 10-12 inches away and the exhaust has affected the rubber flap. First it has deposited black soot on it, put a bit of a bend in it, and rubber is developed more cracks on that side.

Mine are cheap Amazon flaps so I don't care too much, but next set I'll probably bolt some sheet metal over the rubber.

Also GM gas truck.
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Old 04-18-2021, 07:47 PM   #8
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Get a heat shield
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Old 04-18-2021, 08:11 PM   #9
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You’d be surprised how fast hot exhaust will melt a mud flap just driving a couple of miles in town , ask me how I know .

Turnout the exhaust , cheap and quick at muffler shop .
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Old 04-18-2021, 08:59 PM   #10
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We bought a stainless end deflector to put over our tail pipe. That diverted the flow more to the side and downward.
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Old 04-18-2021, 10:16 PM   #11
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Not enough!

Yea I would get a 90į elbow. Your exhaust temp at the manifold is upwards of 1200į when pulling a hill and the cat could heat it again. Donít know how much it would cool by the time it exits the tailpipe but I believe it would burn your flap!
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Old 04-25-2021, 09:10 AM   #12
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Quote:
Originally Posted by mbubbaca View Post
Title was a cheap way to get attention.

I just picked up a rock tamer from Goodwill for $40.00. When mounted on my hitch of my 2500 GMC gasser the passenger side flap is 7 inches from the end of my tailpipe. I seen that there can be an issue with a diesel exhaust being too close, will I be in the same situation? Iíve just put it on to check fitting, clearance , etc. But having second thoughts after measuring the tailpipe to flap. Iíll go to plan B which I havenít researched yet, of changing the tailpipe to vent out the side rather than back. Any real life experience appreciated.
There are stainless 4” round exhaust ports available from Rock Tamers that can be easily cut into the rubber mat. I added them on my Dodge Ram
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Old 04-25-2021, 09:34 AM   #13
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Banks, the diesel wizards, makes a kit for this. I put one on my truck and it works great.
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Old 04-25-2021, 09:37 AM   #14
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Originally Posted by wagvan View Post
I thought this was a family forum....<clutches pearls>
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Old 04-25-2021, 11:14 AM   #15
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Quote:
Originally Posted by mbubbaca View Post
Title was a cheap way to get attention.

I just picked up a rock tamer from Goodwill for $40.00. When mounted on my hitch of my 2500 GMC gasser the passenger side flap is 7 inches from the end of my tailpipe. I seen that there can be an issue with a diesel exhaust being too close, will I be in the same situation? Iíve just put it on to check fitting, clearance , etc. But having second thoughts after measuring the tailpipe to flap. Iíll go to plan B which I havenít researched yet, of changing the tailpipe to vent out the side rather than back. Any real life experience appreciated.
Rock Tamers makes/sells a metal plate that fits on the back of the flap for the situation you are concerned about.
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Old 04-25-2021, 12:40 PM   #16
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2019 Duramax here with the shield. This is before I started using them. In short I ended up rotating the flaps as far rearward as I could to get max distance and even with the shield the flap still warped significantly and exhausted melted all the plastic but covers along the top. Still functional but the flap gets hot especially when pulling a grade

Can't modify tailpipe on the newer GM diesels w/out voiding emissions warranty since it's all part of the new/improved diesel emissions crap Click image for larger version

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Old 04-25-2021, 03:02 PM   #17
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Heat Shield

I have used the Rock Tamers with their heat shield installed on a 2020 GMC Durmax diesel for 10k miles without any issues. I didnít change the angle of the exhaust.
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Old 04-25-2021, 10:12 PM   #18
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Tailpipe

They do make a exhaust shield that can be added to the rock tamers

Being a gas I don’t believe the side pipe bend modified would be a problem
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Old 04-26-2021, 03:06 PM   #19
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Ditto the heat shield. Very easy to install. No need to modify the pipe. Comes from Rock Tamers with all hardware.
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