Funny Exhaust Note

xxxBlakexxx · 02-11-2004, 10:50 PM

I need the experts for this one:

I have noticed that the last few times I have taken my car out, a funny sound is comming from the exhaust or the rear-end, but it may even be originating from under the hood.

During WOT, as the rpms pass 4,000, is when I hear the sound. Almost sounds like a rumble. As the rpms go higher, it goes away. It is not real loud, just different and not the way it used to sound.

I have made NO changes to the exhaust and I feel no loss of power. I suspect perhaps something loose on the exhaust system, but it is not a metal on metal sound.

Here's another thing, when sitting in the driveway with no load on the engine, the noise can not be duplicated. But, as the rpms drop down, I can hear a slight crackle...almost like straight pipes but not nearly as noticeable. I don't know if this is related to the rumble or just me hearing something that was always there before...just never noticed.

I suppose too that the rumble described above could also be comming from the rear-end and not the exhaust...perhaps even the limited slip kicking in.

Any ideas?

Mercury · 02-12-2004, 01:37 AM

Need a little more than that. Could be many things. Though, it sounds like an exhaust leak....Rumble at certian RPM, Crackle at low idle.

Any kind of vibrations or anything like such?

You cant hear a limited slip rear end at work. A locker...yes...limited slip...nope.

GTvert · 02-13-2004, 02:53 PM

like funny ha ha ,like a clown, like it amuses you?

xxxBlakexxx · 02-13-2004, 04:28 PM

No, not quite that funny.

xxxBlakexxx · 02-23-2004, 07:09 PM

I took the car to a dealer today. The service manager is a Mutang enthusisit too....has had lots of them. His first impression of my exhaust was that I had some after market work done on it due to the slightly different sound. But, it is all stock. He believes the sound is from a bad muffler baffle.

I could care less as it is comming off anyway. Just glad that it did not sound serious.

8urvette · 02-25-2004, 09:07 PM

Hi, im new to this site, but i have a large back ground in exhaust. to me it sounds like what you are hearing is exhaust resinance. my 03' Mach does the same thing, it also became a little louder when I installed my Dr. Gas x over, do to more exhaust flow. its just those cheesy ford mufflers. Im switching my cat back to Borla stingers, and I will let you know if it goes away.
By the way the Dr. gas x pipe is awesome!!!!!!!!!

02-11-2004, 10:50 PM	#1
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	Funny Exhaust Note I need the experts for this one: I have noticed that the last few times I have taken my car out, a funny sound is comming from the exhaust or the rear-end, but it may even be originating from under the hood. During WOT, as the rpms pass 4,000, is when I hear the sound. Almost sounds like a rumble. As the rpms go higher, it goes away. It is not real loud, just different and not the way it used to sound. I have made NO changes to the exhaust and I feel no loss of power. I suspect perhaps something loose on the exhaust system, but it is not a metal on metal sound. Here's another thing, when sitting in the driveway with no load on the engine, the noise can not be duplicated. But, as the rpms drop down, I can hear a slight crackle...almost like straight pipes but not nearly as noticeable. I don't know if this is related to the rumble or just me hearing something that was always there before...just never noticed. I suppose too that the rumble described above could also be comming from the rear-end and not the exhaust...perhaps even the limited slip kicking in. Any ideas? __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

02-12-2004, 01:37 AM	#2
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	Need a little more than that. Could be many things. Though, it sounds like an exhaust leak....Rumble at certian RPM, Crackle at low idle. Any kind of vibrations or anything like such? You cant hear a limited slip rear end at work. A locker...yes...limited slip...nope. __________________ 64 1/2 "D" code Red Mustang Coupe. Red Baron, 2000 Perf Red Mustang GT. 5spd. Stage 2 CNC heads with Large Valves, Comp Cams (270-274 dur .550 lift), Forged Crank, DRP pistons, Manly H-beams, Pro M 87 mm Mass Air, 24lb Inj, 75mm TB, Plenum Spacer ,Long Tube Headers, Homemade H-pipe, 2 chamber Flows, 4:10's, Steeda Tri-Ax, LKW 70/30's, Eibach Drag Springs, Steeda SubFrames, Battle Boxes, Rear Girdle, Adj uppers, Alunimum Drshft, Southside Lift Bars. Project Cars, 64 1/2 6cyl coupe, 1930 Model A Nostalgia Rod.

02-13-2004, 02:53 PM	#3
GTvert Registered Member Join Date: Apr 2003 Location: West Plains Posts: 74	like funny ha ha ,like a clown, like it amuses you? __________________ Slower Traffic Keep Right

02-13-2004, 04:28 PM	#4
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	No, not quite that funny. __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

02-23-2004, 07:09 PM	#5
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	I took the car to a dealer today. The service manager is a Mutang enthusisit too....has had lots of them. His first impression of my exhaust was that I had some after market work done on it due to the slightly different sound. But, it is all stock. He believes the sound is from a bad muffler baffle. I could care less as it is comming off anyway. Just glad that it did not sound serious. __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

02-25-2004, 09:07 PM	#6
8urvette Registered Member Join Date: Feb 2004 Location: slc utah Posts: 3	Hi, im new to this site, but i have a large back ground in exhaust. to me it sounds like what you are hearing is exhaust resinance. my 03' Mach does the same thing, it also became a little louder when I installed my Dr. Gas x over, do to more exhaust flow. its just those cheesy ford mufflers. Im switching my cat back to Borla stingers, and I will let you know if it goes away. By the way the Dr. gas x pipe is awesome!!!!!!!!! __________________ If some is good, more is better, and too much is just enough....... ..Carrol Shelby..

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