I have the same problem on my Corsa B 1.0 12V. It all started when I changed centre and rear silencer. I had them changed in an authorised Opel (yeah, continental Europe) garage, but that obviousely guarantees nothing.
It is happening when the engine is cold, but also when it isn't when I pull away at low rev or when I pull away in the hill.
It drives me mad as everyone is looking at me as I would have a crappy car. Otherwise I like my car, but this really drives me mad.

prob bent a bracket your system. the system should fit kinda in the middle of the cut out for it . jack the car up from cold andstart it up you sould c were it catches if not were dose the sound come from

[Edited on 05-10-2003 by astra.n]

"astra.n" yea mate you could be right, but it didnt rattle at all before, only since i knocked it over the speed bump:o

do you think it could be the cat by ANY chance?????
coz if it is then i get it out n put decat in, as ive got a full cat back system aleady

cheers :thumbs:

I've got the same problem too m8, its ma back box thats fuked the baffles inside are loose and makes the car sound like a bucket.

when you start from cold the rubbers on the system are hard. when they warm up they give a bit stopping the rattle, or causeing it to catch on the heat sheild near the cat or over the rear beam the best way to stop it is to heat it up with a blow torch and bend it till it is clear of the prob

my corsa did that as well... never found out why

i have this problem as well.
its horrid!

i also thought it might be the cat rattling against the car.

Got exactly the same problem. Makes the car sound rough!!!!!! Is it the cat touching / banging on the underside of the car???

could be that u have knocked the baffels loose in the silencer, i had it on a sportex system, nowi have the scorpion grp a, it rattles but it rattles on the heat shiled below above the mid box, just cuz its bigger i fink!

i have this problem also..when pulling away...happens when hot 2 tho

hi guys,

ive got a full Scorpion stainless steel cat back group A exaust and i have noticed since about a month ago when i went over a speed bump too fast and knocked one of the hooks of the bracket on the backbox!!!!......that it seems to sort of rattle as i pull away but only when engine is COLD though!!

it sounds similar to the problem i had with the original standard exaust before...which was actually the silencer which had packed in!!!

its deffinatly comming from the middle somwere, hopefully the silencer hasnt packed in again!! hope its just a loose connection or somthing

wat u reckon :wave: