model would be handy, if its a gti then about £15-30 depending on the actual bit you need as there are 2 centre pieces one that is a long pipe thats straight with or without a box towards one end and the next bit is the 2nd box which has a larger silencer on it and connects after the first
1st box roughly £16+vat
2nd box roughly £25+vat
if your after gen parts otherwise check about or ask stuart at eurocarparts he has a section in deals and discounts section check him out