Ignore them mate, if you want 500 out of it reasonably quickly, id looks to put the standard wheels back on it and sell them aftermakret ones separelty...they got to worth atleast a ton. You can pick up standard wheels for peanuts (like 25 quid with legal tyres). Then get a standard exhaust from a breakers and stick that on. Then sell your aftermarket zorst for atleast 50. Thats about a ton back there already although if your good, you should be able to make back 150. Then sell the car and advertise it (anywhere but here! Cars are harder to sell here (IMHO!) ) on places like autotrader or even egay for 400 or 350 depending on how much you get back from the other parts.