Just put on FI metallic HFC's, there is an odd noise which only occurs between 2600-2800 rpm only on deceleration. it also occurs when in neutral just revving it up. as the rpms come down it makes a noise I can only decribe as a rattle snake Zzzzzzz. I put it on the lift at work everything is tight, and its only coming from the drivers side. Any suggestions on what it could be??

 

by the way fellas, so far I put about 350 miles on them

 

I've never had good luck with HFC, they maybe taking a **** already man, mine only lasted a few k miles.

 

i have that too. i just ignore it (never really gave much thought about it)...mainly cause i'm too busy to worry about it at the moment. things have been kinda hectic lately.

give rick a call to see what's up and lmk too! doesn't seem like it's hurting my car or anything, which is why i just kinda brushed it off. i figured it was normal for HFCs. we'll see...

 

any updates on this?

i'm hoping mine will go away after the HKS install

 

Im just waiting for rick to get back with me...

 

You probably have a leak. Did you replace the gaskets?

 

yea.. I replaced them with the gaskets FI provided.

 

Is it the rasp that comes from HFC, i thought that was around 3500 though...

 

well....see the thing is that is doesnt occur during acceleration. It only occurs on decel at around 2600-2800 rpm. like I mentioned before you can be just sitting in the car revving it up & it makes that ZZZzzzzz noise.
its actually quite annoying.

 

that does sound annoying

 

i installed the same cats on my car two days ago. i know what noise your talking about. i was a little concerned at first when i heard it but i figured its just normal for a metalic cat to do that so i havent payed any attention to it.

 

geeeeeeez man , if thats normal for metallic cat, how are you supposed to profile riding around. its embarrassing really. dont get me wrong, I love em' but I dont know if I can be riding around like that.

 

mine goes away after a couple minutes of driving i think

either that or i just forget about it

 

Now I feel extra stupid. I have this noise too with the FI HFC. I thought it was my new engine rattling already, must just be the cats. Ill have to ask Tony or Rick about this.