GM Borla Making Strange Noise

ShamrockShooter · May 18, 2017

I don't hear anything, if your using a phone mic... its not going to pic up sound very well. put the stock exhaust on, you need to do your due diligence and remove/eliminate variables.

Yeah it's a faint noise at idle, louder when driving. I have to turn the volume up all the way on my phone to hear it, but it's audible.

I sent the clip to borla and they were going to listen to it and see if they thought something might have come loose inside the muffler. It sounds like the muffler is a perforated pipe surrounded by a ceramic? tube, so it is possible something got knocked loose inside after a few weeks of driving.

They have a great customer service department.

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Ridersfan · May 18, 2017

Is the truck a 2017? I've heard that the range isn't always effective on a 17... they work intermittently, so you may well have the V4 mode going on without realizing it. Just a thought anyways

ShamrockShooter · May 19, 2017

Is the truck a 2017? I've heard that the range isn't always effective on a 17... they work intermittently, so you may well have the V4 mode going on without realizing it. Just a thought anyways

Nope. Mine is a 16. Trust me you can tell when it's in v4.

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ShamrockShooter · May 19, 2017

So I got a better video and had my wife rev it to about 1200 rpm. (Had to explain what rpm was...). Its a metallic echoing noise about the 30 second mark when I hold my phone near the rear of the muffler. Sounds much more pronounced with headphones on than my phone speaker.

What do you guys think? Normal or no?

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grizzlyltz · May 19, 2017

Defintatly not normal

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USCGRetiredJosh · May 19, 2017

My GM Borla Exhaust was making a sound also like it was rattling or something. I found that the straight pipe after the flex section at the front was hanging low and hitting the cross member. This was causing a rattling type or bagging sound. Went to a Midas and for $50 bucks the welded on a rod with a built in rubber mount and bolted it a hole near that cross member and the add a couple of tack welds. I haven't heard any strange noise's from the exhaust since then.

If people want a pic send me a PM, I don't come on the forums to much.

ShamrockShooter · May 19, 2017

At the time of the video my front pipe had a good half inch of clearance over the frame so it isn't that unfortunately.

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USCGRetiredJosh · May 19, 2017

Here is the pic of the extra support bar I had Midas put on my GM Borla exhaust. Its the bar attached to the side of the exhaust that goes to a square rubber boot and then the bolt to frame.

ShamrockShooter · June 3, 2017

An update. I sent my video to Borla and they agreed that mine didn't sound right so they sent me a new muffler. I would buy again from Borla just because of how awesome their customer service department was.[emoji106]

So I put the new one on today. Much harder than I thought to get all the pipes apart after being on a month. I had to take the whole system off to replace the muffler.

When I put it back together i figured out how to get the front pipe not to touch without bending the hanger. You need to push up on the flex joint up hard to change the connection angle, then tighten the front flange before you tighten anything else. Now I can fit my whole hand between the front pipe and frame.

So the moment of truth, drive it around the block and the new muffler is definitely a touch quieter (needs to break in?). The noise I heard before is a little quieter too but I can still hear it a little.

So I went from stock to MBRP to Flowmaster to Stock To Borla to another Borla. Think I'm done with exhaust for a while......

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