loud interior resonance(Flowmater Mufflers)
Thread Starter
Intermediate
Joined: Jan 2006
Posts: 37
Likes: 0
loud interior resonance(Flowmater Mufflers)
Hi guys, i just cut off my old mufflers off my 1994 lt1 auto corvette and installed two new flowmasters super forty mufflers and now the interior resonace is umberable when you drive.
Has anyone had the same issue?
I left the resonator in place, would a cross over tube help? or do i need to back to stock mufflers.
Thanks
Rick
Has anyone had the same issue?
I left the resonator in place, would a cross over tube help? or do i need to back to stock mufflers.
Thanks
Rick
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Flowmasters are notorious for interior resonance, especially the Super 40's. IF the stock resonator isn't helping, you may want to try an X-pipe but it may not do much good.
You could add some sound insulation in the back of the car; something like DynaMat.
You could add some sound insulation in the back of the car; something like DynaMat.
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
Your resonator should have a crossover built in already so a crossover will not help any. I have the same mufflers and I hate them. I tour my trunk/rear apart and put sound mate down (isn't cheap). This did help with resonation but it's still loud. I would put your stock back on or sell them to me very cheap LOL! As far as performance I feel you will get more out of some free flowing cats especialy if they have any miles on them they are probably cloged or falling apart inside. The stock mufflers are good enough for a stock motor in my opinion.
Pro
Joined: Oct 1999
Posts: 515
Likes: 0
From: Nashua NH
1- change mufflers to something quieter
or
2- put Black Sabbath on CD and turn up louder than resonance
I have Flowmaster 40's on mine; the noise never really bothered me (it's funny when you drive down a street lined with cars and watch in the rear view as you set everyone's alarm off) but to each his own...its similar to having side pipes on a C2!
or
2- put Black Sabbath on CD and turn up louder than resonance
I have Flowmaster 40's on mine; the noise never really bothered me (it's funny when you drive down a street lined with cars and watch in the rear view as you set everyone's alarm off) but to each his own...its similar to having side pipes on a C2!
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
I have Borla, and the have almost no resonance yet still have great sound... my friend had Flowmasters in a mustang, and i would not go with him in the car because of the resonance, very bad....
Intermediate
Joined: Apr 2010
Posts: 49
Likes: 0
From: Cambridge Maryland
1- change mufflers to something quieter
or
2- put Black Sabbath on CD and turn up louder than resonance
I have Flowmaster 40's on mine; the noise never really bothered me (it's funny when you drive down a street lined with cars and watch in the rear view as you set everyone's alarm off) but to each his own...its similar to having side pipes on a C2!
or
2- put Black Sabbath on CD and turn up louder than resonance
I have Flowmaster 40's on mine; the noise never really bothered me (it's funny when you drive down a street lined with cars and watch in the rear view as you set everyone's alarm off) but to each his own...its similar to having side pipes on a C2!
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Safety Car
Joined: Feb 2000
Posts: 3,771
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From: MANDEVILLE, LA La
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
I got droning even with the fancy Delta Flow 50s. Most aftermarket mufflers will get you some drone its a short exhaust system and youre practically sitting on top of the mufflers. X pipe wont get rid of it
Try some Corsas or go back to a stock type muffler.
Try some Corsas or go back to a stock type muffler.
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 235
From: Bangkok, Thailand
(prefaced with "I was the lead tech advisor for Flowmaster for 2 1/2 years")
This is why Flowmaster offers kits for certain vehicles. Often there is a specific need for a matched resonator and specifically tuned mufflers - as is the case with the LT-1 Corvette.
Basically, if they offer a kit, there is a reason for it - sound control in this case.
This is why Flowmaster offers kits for certain vehicles. Often there is a specific need for a matched resonator and specifically tuned mufflers - as is the case with the LT-1 Corvette.
Basically, if they offer a kit, there is a reason for it - sound control in this case.
Le Mans Master
Joined: Jul 2007
Posts: 5,356
Likes: 2
From: No HOA, New Hampshire
Cruise-In X Veteran
St. Jude Donor '09
I have the 50 series and conversation and the stereo push the exhaust sound into the background. Outside the sound will turn some heads especially when it is cold.
Safety Car
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
(prefaced with "I was the lead tech advisor for Flowmaster for 2 1/2 years")
This is why Flowmaster offers kits for certain vehicles. Often there is a specific need for a matched resonator and specifically tuned mufflers - as is the case with the LT-1 Corvette.
Basically, if they offer a kit, there is a reason for it - sound control in this case.
This is why Flowmaster offers kits for certain vehicles. Often there is a specific need for a matched resonator and specifically tuned mufflers - as is the case with the LT-1 Corvette.
Basically, if they offer a kit, there is a reason for it - sound control in this case.
Racer
Joined: Aug 2007
Posts: 305
Likes: 1
From: DRAYTON VALLEY ALBERTA
I have the drone with my flowmaster pipes(with resonator) and Dynomax Super Turbos. But like mentioned before, Man I like setting off car alarms. And the noise it makes when turning hard... you cant beat it. So they stay. I may try dyna matting
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 235
From: Bangkok, Thailand
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Racer
Joined: May 2009
Posts: 421
Likes: 2
From: van buren ar
may sound weird but i noticed a drone reduction after i installed my long tube headers.and i did a gear change which moved the drone range away from highway speed completely.but that is an expensive solution.and it drones @40mph now,so you rob peter to pay paul.either way super 40s are a mess.
Racer
Joined: Aug 2007
Posts: 305
Likes: 1
From: DRAYTON VALLEY ALBERTA
Those are the pipes I have with some Super Turbos on the back. I didnt notice any change from thet resonator with those mufflers. But then again I had on a single 3" midsection and no longtubes and nothing was mandrel bent and it was 2.25" piping, before that. Aswell as stock power. Now My motor dyno's 408hp and 536ftlbs, with a set of mufflers on the end of the headers at dyno time. Not saying the Flowmasters wont change that. I was thinking of Taking that resonator out to see if I can get some more noise. But now I have 3.33's instead of 3.07 so we will see what comes.
Last edited by 87stocker; May 12, 2010 at 09:15 AM.