Do Flow's resonate at 3krpm?

[94-302-vert]

I have flowmater 40's welded into the original 2.25" pipes on my car. IT sounds horrible at 3k rpm on the highway (only time I maintain that kind of RPM)... so is it the flows I am hearing... seems to be from 80 mph on, almost a marbl-like or rattling sound. I am pretty sure it is the exhaust but want to know if anyone elese gets this as well...

THanks guys...

 

[95CobraMike]

doesnt sound normal... mine resonate at about 2k i think.... i havent driven my car for a while but i think its at 2k and it sounds sweet.... do you still have cats?

 

[95opal]

like mike said 2k is sweet spot for the flows.as far as the marble rattle your experiencing,(if not detonation) then possibly the insides of your flows are blowing apart.had a couple go south on me and they sound like crap.

 

[timeless2]

I've never heard Flows drone at 3K, in any 5.0 or 4.6. It's always around 1800-2300.

 

[Swarzkopf]

How do the insides of Flowmasters "blow apart"? Basically the only components inside a Flowmaster muffler are steel plates?

 

[95opal]

the only components inside a Flowmaster muffler are steel plates?

exactly! spot welds

 

[95snoozer]

How do the insides of Flowmasters "blow apart"? Basically the only components inside a Flowmaster muffler are steel plates?

the rust and break the welds of the chamber deflectors

my friends 9 second car did that and it would shoot metal shrapnal out in the burnout box. we had to get a magnet and pliers to pull some out before the track to be safer

you arent running an x pipe with your flows btw? that would cause some bad sound

and the 2k resonance is a mustang thing not a flowmaster thing, some mufflers just exagerate the sound

 

[BlackVert]

mine also resonate around 2000 rpms.

 

[mricci]

Mine resonates at 2000, and why do you say an x pipe makes flows sound bad? I have a few friends with o/r x's and flowmasters and they sound really good.

 

[timeless2]

X with Flows is

 

[Blackened302]

weird... mine is the worst at 1k

 

[Pokageek]

Mine were fine but I didn't like the drone so I got thrush turbos.

 

[94-302-vert]

I have no cats (O/R H-pipe). Before the removal of the cats they flows droned at 2k rpm. No cats stopped that.; THe 3k drone/rattle/abnoxious has always been there (at least since the gears were done in march). I am pretty sure I have experienced it in 4th gear a couple of times so I am pretty sure it is the mufflers.

So how long have you guys had flows last?

 

[BlackVert]

So how long have you guys had flows last?

mine are about 2 years old now.

 

[5.0_GT_kid]

My flowmasters are almost a year old but they are already starting to get rusty. I'm gonna replace them with a Magnaflow or Magnapack catback.

 

[Pokageek]

Not to be contradictory but I have had flows for years and never had one rust out on me. In fact, I had one on a previous car that got dragged down the highway for 1/8 mile on solid asphault b/c it was not bolted on properly. That was 8 years ago. I sold it when I sold the car. It is STILL running on my friends chevy truck and STILL sounds awesome! The bottom of his truck including his brakelines are rusting out and that flowmaster looks practically new. It is going to outlast the truck.

 

[urban96]

about 2k here also

 

[donjohn]

your cat internals have probably fallen to pieces like mine. To check, wack the cat with like a hammer and see if it resonates when the car is off... i'm getting that noise and am in the process of getting an O/R pipe

 

[94-302-vert]

I have no cats... well I have 2 cats but they are pets not catalytic convertors...

 

[1994Vib.RedGT]

I have a bassani o/r x and flows and I LOVE the sound, it does resonate/drone at 2k rpm though. as far as rust, ive heard it can happen, but my flows have been on the car since 1996 and no rust or problems yet