i had this problem i lowered my car 80mm and the exhaust clamp where the back section meets the middle section of the exhaust had become weak and alowed the exhaust to shag, so i put a new clamp and repositioned the exhaust and rattle gone

also try taking the back box off again and re-fitting it, pushing it on as far as it will go, cos if its not on far enough it'll bow at the axle, lowering itself and banging like it is, i had this problem on mine, with the same backbox

u can also check and see if the u brkt that holds the two exhaust pipes together (backbox & Mid section) has come loose, if it has the exhaust pivots and drops down, has annoyed me a fare few times on previous corsa's. they are 13mm i think

leave the black rag and hope its a numpty that buy's it...?

or any local motor spares shop shuld do them.
sounds like the heavey weight of the magnex has stretched the rubbers to hang lower and bang on axle.

i went in their a while bk and they said they don't stock them. Mind u i asked a women. cheers mate

local halfords etc. 2 quid each

where from, tried search engines and i comes up with fcuk all.

go buy some new rubbers.

i cant sell it with the exhaust banging on the rear axel. At the moment ive wrapped some black cloth round the axel and i cant hear the exhaust bang.

But lets face it no one wants to buy a car with a somin wrapped round the axel.

cars lowered -60 and its a magnex oval back box.

Any help welcome