69_340_GTS
Well-Known Member
Just 2 mufflers total. One on each side. My '01 Mustang was like that. They used an H-pipe too.
Trying to Eliminate Drone. Need Another Opinion.
- Thread starter MuuMuu101
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Just 2 mufflers total. One on each side. My '01 Mustang was like that. They used an H-pipe too.
LJ67barracuda340
Well-Known Member
I'm fighting a nasty drone from my 340 (1500 to 1900 rpm)with Dougs long tubes, 2 1/2 X pipes, Pipes straight thru packed mufflers, 2 1/2 tailpipes out the back. Switched the mufflers to DynoMax chambered, still droned (but sounds sweet). Added Vibrant 14" bottle resonators in front of the mufflers, 10% less drone (maybe). I'm wondering about a branch resonator off the muffler or off the tail pipes. My point is the resonator in front of the muffler didn't work. Pic is before the resonators were installed just ahead of the mufflers.
Can you just slip fit them into the end of the pipe? Just for a sound test? I think you’ll have enough room to just stuff it on for a sound test. Maybe not so much driving with them in though... LOL!
Well, I have turndowns. So, I'd have to cut off the turndowns and slip them on, trying to bend the exhaust below the bumper. So, I'd need new exhaust tips if the resonators don't work.
I have the same exhaust kit from tti. Just shove them on for a sound test before you cut anything.
Packed mufflers ,"Magnaflow ,Borla " ,are O.K. ,they don't really last . Stay away ,from anything "chambered " . The one muffler I trust here ,would be a Ultra Flow , extra long case. Fitting a good 2.5 " system under a A body Mopar ,is a learning experience, Mu...
jos51700
Green Bearing thread connoisseur
Again, what you need is a helmholtz. The only straight section needed is for an easy attachment pipe. They can be perpendicular, you can bend them to run parallel to whatever wackiness you have under there, it can even be a non-tubular chamber (although the math may change a bit).
No more drone!
The above link addresses specifically the issue you describe.
gtxdude
Well-Known Member
That's my car above in #33. Resonators went behind gas tank and tucked up, you can't even see them from behind. If you do see them it looks like back of gas tank. I went from Flowmasters to Magnaflow, better sound but still had drone at different rpm. Local shop dealt with it and did great job! Great sound, no drone, love it 
C130 Chief
Mechanical Genius
Google "1/4 wave exhaust resonator" plenty of BS and ballyhoo along with some useful theory. Added a 26" x2" to my truck a few years back, worked great to take the drone out of the generic turbo 3" single muffler. Eventually I ditched the turbo and resonator tube and switched to a Walker 22636 heavy-duty muffler and a simple turn down under the bed, even better. I don't think the HD Walker will fit under an A-body though.
goldduster318
Overzealous Car Modifier
I still think you need to lop off the turndowns and stick the exhaust about 1/2" past the bumper first.
I have the same system (but with long tubes), and it droned/drummed under the car like crazy with the turndowns. I went with some stainless tips that stick out past the bumper and it helped a lot. The car is actually pretty quiet inside with the ultra-flos
I have the same system (but with long tubes), and it droned/drummed under the car like crazy with the turndowns. I went with some stainless tips that stick out past the bumper and it helped a lot. The car is actually pretty quiet inside with the ultra-flos
That's my car above in #33. Resonators went behind gas tank and tucked up, you can't even see them from behind. If you do see them it looks like back of gas tank. I went from Flowmasters to Magnaflow, better sound but still had drone at different rpm. Local shop dealt with it and did great job! Great sound, no drone, love it
My exhaust is going to have to be addressed another time as I'm booked for the end of my vacation. But I think the plan is doing a mix between these two methods. I kind of like how the Helmoltz system is set up in this picture. Super easy and straightforward.
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