2010 FX50s Fluttering noise on Decel

S

SilverStreakFX

Member
Car
2010 Fx50s
Has anyone experienced a fluttering noise (similar to a card in the spokes of a bicycle) when letting off the gas to coast? Seems more apparent when it downshifts as well. I will try and post a video of it. Does not seem to be the axle click. The noise seems a bit too soft for it.

My FX50 has ~57k miles on it.
 
SilverStreakFX said:
I do have a Borla catback on it. I bought the car used like that so I have nothing to compare it to.
Click to expand...
I also had the fluttering noise on decel but it wasn’t until I fitted the resonated test pipes that it got a lot louder. in place of the secondary cats I replaced the gaskets from main primary manifold cats to secondary cats before the test pipes and it was a bit quieter. But after test pipe install the flutter was a lot louder. I tried so many things to get rid of that flutter sound. I could go on and on. But only thing worked and many ppl will advise against it because it causes the pipes to wear prematurely. But I don’t care because the sound is perfect now. So my solution is to heat wrap from the test pipes all the way back to the tips. Including the muffler with DEI brand muffler wrap. The flutter is gone. Now I have amazing crackles, burbles and pops on decel. Especially when down shifting. Sounds amazing to me. I have also been dyno tuned twice. Gained 20 Hp and 30 ft/lbs. also have dyno graph to prove
 
Laughingjuice said:
I also had the fluttering noise on decel but it wasn’t until I fitted the resonated test pipes that it got a lot louder. in place of the secondary cats I replaced the gaskets from main primary manifold cats to secondary cats before the test pipes and it was a bit quieter. But after test pipe install the flutter was a lot louder. I tried so many things to get rid of that flutter sound. I could go on and on. But only thing worked and many ppl will advise against it because it causes the pipes to wear prematurely. But I don’t care because the sound is perfect now. So my solution is to heat wrap from the test pipes all the way back to the tips. Including the muffler with DEI brand muffler wrap. The flutter is gone. Now I have amazing crackles, burbles and pops on decel. Especially when down shifting. Sounds amazing to me. I have also been dyno tuned twice. Gained 20 Hp and 30 ft/lbs. also have dyno graph to prove
Click to expand...
Sorry forgot to mention I also have the Borla cat back
 
Update: Picking up the FX from the dealer this afternoon. I took the tech out for a test drive. He did verify the noise. And, yes, it is coming from the exhaust. I am going to find out where in particular to see if it can be fixed or have to live with it.
 
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