Fox Exhaust Question

[dz01]

So I bought my car with a s/s magnaflow system, BBK headers/race cat already installed. The car was extremely quiet. Too quiet for my liking. I subsequently pulled the cats off which definitely made it sound louder, but I didn't like the tone. Sounded raspy. I then replaced the magnaflow mufflers with s/s 2 chamber flowmasters. Car sounds great, but is extremely loud which is awesome until I get a phone call or I really get on it and draw a lot of attention from any near by law enforcement.

My question is whether putting the cats back on would quiet it down considerably or just a little?

I probably should have replaced the mufflers first.

I'm sure someone is running flowmasters with BBK headers/cat.

 

[hoopty5.0]

cats always killed the sound on any mustang I've had.

 

[Gearbanger 101]

We could've saved you a pile of time and money had you posted here sooner. Flowmaster's are universally known to be obnoxiously loud. Putting your cats back on will help a little, but nothing gets rid of that 1800-2300 RPM drone altogether. That's the nature of any chambered muffler.

 

[Mustang5L5]

Cats will make the car quieter. Plus you will shift the torque curve lower which is much better for street driving.

 

[25thmustang]

Honestly the flowmasters are going to drone even with cats. It will be quiter but will drone still.

 

[MFE92]

STOCK cats will make the car quieter, but race-style aftermarket ones won't make a dent.

If it's drone you want to kill, no ifs ands or buts, the easy way is to install some Dynomax VT mufflers, which have a valve in them that stays closed and pretty quiet until you romp on it. I have them, and I like them a lot. They are the ONLY muffler I've ever had on the car, that honestly didn't drone. I dont' give a what anyone says, every other muffler on the planet except for stock ones will drone unless you have longtubes.

The other way to completely knock it out is with 1/4-wave tube resonators. Harder to do, but works like absolute magic. http://www.stangnet.com/mustang-forums/threads/killing-drone-with-1-4-wave-tubes.861893/

Video of Dynomax VT's on my mustang, when I had dumps, with the microphone under the console directly below the armrest.

 

[revhead347]

Taking off the Dynomax S/S mufflers and putting on 2 Chambers, on my god, that's like throwing out the shrimp sauce and pouring on ketchup. I'd put the dynomax's back on. They might be a little quieter, but at least you won't be seeing a psychiatrist in 5 years from post highway drone stress disorder.

Kurt

 

[Grabbin' Asphalt]

 

[Gearbanger 101]

I've got the Pypes Race Pro's on mine and they're quiet and subtle and light cruise, throaty at moderate throttle and outright obnoxious at full cry. They're definitely a versatile muffler. Best part of all.....the're cheap. That being said, I also run long tubes and an O/R H-pipe.

 

[santos]

I also am running pypes violators, they are reasonably "quiet" at cruise, but get quite loud when your on the go pedal. mated currently with shorties and bassani off road x pipe

 

[Audiophile]

I have Flowmasters with stock cats. Yes, they drone some. It actually doesn't bother me too bad though. I've done enough sound deadening in my car to make it much better. I actually like the throaty tone, just wish it was a little louder. I don't like obnoxiously loud, or that popping cherry bomb stuff or whatever it is, but a good growl when you get on it always sounds good to me.

 

[Norm Perreault]

Has anybody heard or tried BBK, axle back adjustable

 

[Gearbanger 101]

Had to get rid of my Pypes Race Pro's. Too loud. Got a set of Borla ProXS's in their place now. Much more reasonable for a street car.

 

[89stang1]

My experience with cats over the years are ya cut or gut em!! theses days i just dont use them. The only exaust system that will ever be on my car is longtubes with shorty off road H pipe and Macs from there on back i have no drone its loud as hell but i like it that way just hold in the clutch and glide when law enforcement is around

 

[Norm Perreault]

Thanks for the feed back, how about roush

 

[deathb4dismount]

I had flowmaster 40s with dynomax cated h pipe. Just loud enough, but like everyone else said flowmasters will drone no matter what.