id keep it luca, its a nice nice car and youl have lost alot of money if you wanna sell now, tis pritty daft reason for sale aswell, no traction.....drive slower
any way keep it mate!! 
and if you change you mind with the ic, il help you if you like? 
Love the s3 but want something with a bit more noise

. Joe its kind of you to offer your help but i would want all the bolts to be fixed to the car and ic instead of left over

. Only joking mate, nice one for the offer.
To make things worse ive just seen a lovely gp for sale only £16k, will always fetch good money in the future as there are only 444 in the uk and 2000 worldwide. Also the fact that its 50kg lighter than a normal cooper s which puts it at around 1050kg, 218bhp (which would be increased to 280ish if i get one), lsd, no rear seats, carbon fibre spoiler, recaro front seats, jcw suspension and brakes etc make it a very attractive buy.