Buzzing after installing extractors

[Vectose]

After installing my extractors I have got a metallic buzzing noise kind of a raspiness coming from underneath the car at the front. It starts at about 4k RPM and continues all the way to 8k RPM.

I have checked the whole thing for leaks and could not find any. I used a piece of hose and a funnel to try and hear for leaks and went around each flange. Even had a mate rev it up to 5k and still couldn't find any leaks.

Where I found the noise to be most noticeable was at the flex pipe. Could also feel the buzz.

[vipfto]

assume o2 sensor is tight? either loose bolt or just give some time for them to carbon up

[Vectose]

Yup O2 sensor is tight. All bolts are tight. Have driven about 100kms on them now.

[silverGPX]

We have covered this not two weeks ago.

Search shadowarriors posts.

[Vectose]

shadowarrior was saying that it happens when decelerating. With mine it happens while accelerating and decelerating.

[BorepYano]

it's all the additional killer wasps from the new extractors obviously.

[PHIL069]

Could it be the internals of the cat vibrating with the increased flow of exhaust gases?

[Vectose]

That's what I was thinking. The cat is not stock it is a Catco and has a build date of 2006 on it.

[PHIL069]

Does the buzzing noise at least drown out the tapping and squeaking?

[Shhtuart]

I remeber bennoz saying something about carbon deposits when someone brought this up ages ago.

Give it some time to get sooty.

[Bennoz]

It'll be the flex. Heat wrap it if it's giving you the sh*ts. But yes, give it time to soot up first (if they're new.)