Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

hey

i have a 1.0 litre corsa b and i have a big bore on it.
it also has no middle box attached, it sounds great when im driving slow bt as soon as i put my foot down it makes a tinny rattling noise.....

i had an irmscher exaust on it before and it was the same story with that.

im just really confused, i want it to sound nice bt no exhaust will stop this :/

please help!!!!!

get a middle box put back in it, should make the problem go away