4x4labs rear and exhaust issues (1 Viewer)

Joined
Mar 29, 2009
Messages
485
Location
Rio Rancho, NM
With my 4x4 labs rear bumper installed and the exhaust cut to fit the bumper the exhaust drone is loud horrible over 3k rpm. When driving in town its not bad but when it downshifts gets bad. Has anyone else had this issue?
Ideas on fix. I wouldn't think chopping a foot off would make that much difference. Recomendations?
Wouldn't think it would matter that much behind the muffler...
 
Joined
Apr 2, 2015
Messages
660
Location
Valley Springs, CA
Yes I had this issue. I thought something crazy must be wrong. It turns out that, under heavy acceleration, the engine and therefore exhaust would shift an inch or so and be blowing right into the "wing" of the rear bumper. This has a megaphone effect and sounds like the exhaust has been routed inside the back of your cruiser at high RPM. This can be solved for free by sticking a wrecker bar, or something similar, into the end of your exhaust and bending it a couple few inches down or towards the rear passenger tire.

Hope that helps
 

Fj moneypit

Cubic Zirconia Member
SILVER Star
Joined
May 11, 2013
Messages
1,146
Location
Colorado
I cut off the resonator to fit a kamar tire carrier. The exhaust sound is deeper and drony. And the whistle got louder. The drone doesn't bother me it's the whistle!
 
Joined
May 31, 2010
Messages
2,374
if it is blowing into the wing cut it at an angle so it blows down some. might help. When i cut mine off with the sawzal i just made two cuts so it has a two angle tip if that makes sense. Kind of like factory on some cars. One cut vertical one 45 degrees. I have some whistle but that is it. I only hear it if i am accelerating near something that will reflect the sound back like a highway divider.
 

LandCruiserPhil

Peter Pan Syndrome
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Mar 10, 2004
Messages
25,030
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Scottsdale Arizona
Yes I had this issue. I thought something crazy must be wrong. It turns out that, under heavy acceleration, the engine and therefore exhaust would shift an inch or so and be blowing right into the "wing" of the rear bumper. This has a megaphone effect and sounds like the exhaust has been routed inside the back of your cruiser at high RPM. This can be solved for free by sticking a wrecker bar, or something similar, into the end of your exhaust and bending it a couple few inches down or towards the rear passenger tire.

Hope that helps

▲Same problem▲

Crazy loud inside and outside at high RPM, melted the drain lines:eek:

I was challanged due to less room than most with an Aux tank but I found a $25 fix. Now back to normal

Before - No bueno

img_5506-jpg.1284269


Muy muy bueno with 5.6 gain in HP going chrome:smokin:

img_5516-jpg.1284270
 
Joined
Jul 6, 2013
Messages
1,489
Be sure to add a hanger back there, if not the muffler will crack sooner than later.

This ^^

I didn't add a hanger and I lost my muffler hanger on a wheeling trip. Bailing wire saved the day.

When I got back into town, I took mine to a local shop and he worked some magic. Added 2 hangers and some pipe that was turned down for like $65. Damn cheap and it solved all my issues.

If you want some pictures, let me know and I'll grab some.
 

Hinterland

Supporting Vendor
Joined
May 21, 2015
Messages
115
Location
Buellton,Ca
With my 4x4 labs rear bumper installed and the exhaust cut to fit the bumper the exhaust drone is loud horrible over 3k rpm. When driving in town its not bad but when it downshifts gets bad. Has anyone else had this issue?
Ideas on fix. I wouldn't think chopping a foot off would make that much difference. Recomendations?
Wouldn't think it would matter that much behind the muffler...

I had the same issue when I built my Hanna Quality rear bumper. But the factory resonator I removed was too big to go back on well. I went to my local muffler shop and he had a brand new resonator sitting around from a dodge 1500 that came straight from the dealership for aftermarket exhaust. It was much more streamlined than the toyota OEM one. welded it on and no more noise issues.
 

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