Don't want be the bearer of bad news but you're going to have to break it to get your money back. There's ones going for £900 quid that aren't broken and unfortunately mods don't really add value to a car unless you find someone that really wants them and is willing to pay. If your exhaust is worth £600 quid id sell that, the wheels and intercooler and scrap the rest. If not get it repaired and you might get £1200 for it. GLWTS