Strange Rattle During Acceleration - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Jmbradleymd · 09-23-2025, 02:20 PM

2014 SS1 LS3 104k with factory short shifter, NPP Exhaust (Fuse removed) and a UPR Catch Can.

The noise I've noticed since I inheritted the car this past November.

I've checked the alignment weld tab that comes loose and rattles. These are both fully attached and I've even bent the tab out of the way for the day they do come loose. No loose clamps that I can see. I have banged on the exhaust with a rubber mallet. I'm unable to produce this noise or anything close to it unless I'm driving.

Any help, suggestions, insight would be great thank you.
(Bad enough dealing with dealer brake pad squeal that were installed the summer prior.

https://youtube.com/shorts/0wa3OFIXk-o?feature=share

https://youtube.com/shorts/T-ZW_52ZW7w?feature=share

b4wheeler · 09-24-2025, 09:02 AM

Where in Maryland. Looks Eastern Shorish..... I would check for any loose heat sheilds to start.

Jmbradleymd · 09-24-2025, 12:30 PM

Salisbury Berlin.

Checked heat shields. I'll check more under the hood as well. Other thought was rock rattling.

b4wheeler · 09-25-2025, 08:48 AM

does it happen at certain speed or RPM? Or just randomly?

Jmbradleymd · 09-25-2025, 10:52 AM

WOT if you let off it goes away. It's not there under any other conditions.

1JEWLDSSRS · 09-25-2025, 08:04 PM

I turned up my volume to the max, and still couldn't hear anything..

Jmbradleymd · 09-29-2025, 10:00 PM

In the two videos the first one is about halfway through the video. The second video it’s about halfway and then also towards the end.

Jmbradleymd · 10-11-2025, 06:03 PM

If anybody is in Ocean City, MD for cruising you are more than welcome to hear it in person.

Jmbradleymd · 10-27-2025, 06:48 PM

This is a video of hitting the exhaust. There are no heat shields or loose bolts or clamps. The car has also gotten louder. What's the likelyhood the converters are coming apart?

https://www.youtube.com/shorts/C0-K7FvdT2U

Joe.G · 10-28-2025, 08:10 AM

The sound seems to be coming near where you are hitting it, Now sound of course can travel but it doesn't appear to be. Is the welded on exhaust hanger in the video leaking? make sure none of them are starting to break loose. the exhaust is very easy to take off and will come off as one complete piece. Take it off and do the same test off the car and rule out the unit it shelf.

xstuntman · 10-28-2025, 10:44 AM

Cant say I've paid attention to how the factory exhaust clamps together (or welded?) but I would consider shining a flashlight into each cat.

Jmbradleymd · 10-28-2025, 09:41 PM

Next nice weekend I'll lift the car up and pull the exhaust.

1JEWLDSSRS · 10-30-2025, 12:50 PM

Check your tunnel brace at the front of your system, can't really tell, but it looks kinda close to touching the pipes at the front of the catback, maybe when the engine torques ove while you are driving it the pipes are touching it? And maybe when you are banging on it, it is touching? Just a thought. Sometimes when you have a 3 inch catback the pipes don't clear the brace very much, that's why I had to install a BMR brace on mine, or you could install some washers between the floor and the brace for clearance.

09-23-2025, 02:20 PM	#1
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	Strange Rattle During Acceleration 2014 SS1 LS3 104k with factory short shifter, NPP Exhaust (Fuse removed) and a UPR Catch Can. The noise I've noticed since I inheritted the car this past November. I've checked the alignment weld tab that comes loose and rattles. These are both fully attached and I've even bent the tab out of the way for the day they do come loose. No loose clamps that I can see. I have banged on the exhaust with a rubber mallet. I'm unable to produce this noise or anything close to it unless I'm driving. Any help, suggestions, insight would be great thank you. (Bad enough dealing with dealer brake pad squeal that were installed the summer prior. https://youtube.com/shorts/0wa3OFIXk-o?feature=share https://youtube.com/shorts/T-ZW_52ZW7w?feature=share

09-24-2025, 09:02 AM	#2
b4wheeler Drives: 2011 Camaro 2SS Vert Join Date: Oct 2015 Location: Cordova, Md Posts: 623 View My Garage	Where in Maryland. Looks Eastern Shorish..... I would check for any loose heat sheilds to start. __________________ 2011 2SS/RS Convertible, Victory Red, Roto-Fab CAI, Stainless Power 1 7/8 headers, No Cats, Straight piped, Bo White TB, Circle D, 3.91, ZL1 CONVERSION, CDC Roll bar and some powder coating and dipping.

09-25-2025, 08:48 AM	#4
b4wheeler Drives: 2011 Camaro 2SS Vert Join Date: Oct 2015 Location: Cordova, Md Posts: 623 View My Garage	does it happen at certain speed or RPM? Or just randomly? __________________ 2011 2SS/RS Convertible, Victory Red, Roto-Fab CAI, Stainless Power 1 7/8 headers, No Cats, Straight piped, Bo White TB, Circle D, 3.91, ZL1 CONVERSION, CDC Roll bar and some powder coating and dipping.

09-25-2025, 08:04 PM	#6
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 13,687	I turned up my volume to the max, and still couldn't hear anything.. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

10-28-2025, 08:10 AM	#10
Joe.G Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021 Location: NY Posts: 1,654	The sound seems to be coming near where you are hitting it, Now sound of course can travel but it doesn't appear to be. Is the welded on exhaust hanger in the video leaking? make sure none of them are starting to break loose. the exhaust is very easy to take off and will come off as one complete piece. Take it off and do the same test off the car and rule out the unit it shelf. __________________ GM 3.91/TrueTrac OEM ZL1 Rims, 6 Piston Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, GC Aluminum DS,Stainless Works Ceramic LTH/HiFlo Cats, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace, Moroso Catch Can,SCT X4 Dynosteve,Remote Clutch reservoir,Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount.

09-24-2025, 12:30 PM	#3
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	Salisbury Berlin. Checked heat shields. I'll check more under the hood as well. Other thought was rock rattling.

09-25-2025, 10:52 AM	#5
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	WOT if you let off it goes away. It's not there under any other conditions.

09-29-2025, 10:00 PM	#7
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	In the two videos the first one is about halfway through the video. The second video it’s about halfway and then also towards the end.

10-11-2025, 06:03 PM	#8
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	If anybody is in Ocean City, MD for cruising you are more than welcome to hear it in person.

10-27-2025, 06:48 PM	#9
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	This is a video of hitting the exhaust. There are no heat shields or loose bolts or clamps. The car has also gotten louder. What's the likelyhood the converters are coming apart? https://www.youtube.com/shorts/C0-K7FvdT2U

10-28-2025, 10:44 AM	#11
xstuntman Drives: 2012 Victory Red LFX Join Date: Dec 2012 Location: west central Texas Posts: 1,341	Cant say I've paid attention to how the factory exhaust clamps together (or welded?) but I would consider shining a flashlight into each cat. __________________ '18 SS wheels, colored matched Heritage grille, actual driving lights, ZL1 strut tower brace, GM Performance billet aluminum fuel door, victory red rotors and calipers, 1/4 window American flags, splash guards, AEM dry panel air filter, Hot Wheels steering wheel and seat covers, Hot Wheels exterior emblems.

10-28-2025, 09:41 PM	#12
Jmbradleymd Drives: Chevy Camaro SS Join Date: Mar 2025 Location: MD Posts: 7	Next nice weekend I'll lift the car up and pull the exhaust.

10-30-2025, 12:50 PM	#13
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 13,687	Check your tunnel brace at the front of your system, can't really tell, but it looks kinda close to touching the pipes at the front of the catback, maybe when the engine torques ove while you are driving it the pipes are touching it? And maybe when you are banging on it, it is touching? Just a thought. Sometimes when you have a 3 inch catback the pipes don't clear the brace very much, that's why I had to install a BMR brace on mine, or you could install some washers between the floor and the brace for clearance. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.