flex pipe resonance
Thread Starter
Drifting
Joined: Aug 2010
Posts: 1,839
Likes: 45
From: nassau co. new york
flex pipe resonance
hello to all and still enjoying my old gal which is running very well lately and have not done much since the ordeal with the brakes.i am running flowmaster 40's and love the sound but have always had a resonating sound in mid rpm range that does not sound good.it is not the drone ,which has cost me the company of my gf,but is more like a rattling sound.just put the t-tops back on and it is less noticeable now.my question is can these cheap ss flex pipes be causing this noise? 
Thread Starter
Drifting
Joined: Aug 2010
Posts: 1,839
Likes: 45
From: nassau co. new york
thanks guy's but Mel the drone i can live with it's the rattle i don't like.i looked up the dynomax vt's and i wonder if they would also eliminate the rattle.is it the 17157 model for our cars?do they sound like the 40's.gungatim you are clearly a man of few words but have you experienced this?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Well, adding mass to the suspected culprit should let you know if that sound changes...or not. Just wrap that flex pipe in something that won't melt or catch fire and listen to sound, again. If nothing changes, it isn't the flex pipe. If it changes for the better, maybe wrap the flex pipe in fiberglass heat wrap stuff.
It's a bit of 'trial and error' to find an offending resonance. But, that's basically the process. Add mass to the suspect item and listen for change. You'll know it when you "don't" hear it.
It's a bit of 'trial and error' to find an offending resonance. But, that's basically the process. Add mass to the suspect item and listen for change. You'll know it when you "don't" hear it.
Burning Brakes
Joined: Apr 2008
Posts: 1,222
Likes: 93
From: shelbyville West Michigan
thanks guy's but Mel the drone i can live with it's the rattle i don't like.i looked up the dynomax vt's and i wonder if they would also eliminate the rattle.is it the 17157 model for our cars?do they sound like the 40's.gungatim you are clearly a man of few words but have you experienced this?
Thread Starter
Drifting
Joined: Aug 2010
Posts: 1,839
Likes: 45
From: nassau co. new york
thanks gungatim but i have inhaled so much asbestos in my lifetime i consider myself lucky to be alive.(steamfitting).i will try the wrap and report back my findings as it might help someone else.
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Back in the day flex pipe would not pass NJ vehicle inspection. Not sure about NY.
Thread Starter
Drifting
Joined: Aug 2010
Posts: 1,839
Likes: 45
From: nassau co. new york
update on this for those who have experienced it.put very thin crap muffler bandage on the flex pipes and the rattling is reduced by at least half.no doubt this is the cause.thanks everyone for the advise. 
