another irratating noise...

[makkie_d]

can anybody point me in the right direction... I fitted a cat back yesterday and
on the motorway today I noticed that when at 60/70mph if I hold steady
revs, I can hear a noise from the engine that sounds like
blowing the top of a bottle really fast (if that makes sense) I think its to do with my induction kit as the bellend before me bodged it on to the throttle body housing with ducktape (see my new vtr thread for a pik of the engine) but I just wondered if anyone new what it was

[makkie_d]

Also does this wen pedal is pressed at a very specific Point.
so I was wondering if this could just be to do with the throttle
body not getting a proper feed??

[ashleyoneill]

Exhaust is vibrating at certain RPM or causing something to vibrate.

I found with mine it was vibrating the gearbox plate that the manifold bolts through.

[makkie_d]

:wall: yeh but f*ck know`s what it rattling?? it only does it at 40 if i feather the throttle at a certain point or the same at 60/70mph, such a shitty noise though?!? and the worst part is it wont do it at a standstill so i cant locate the source of it!!