Ok so I am a totally Newbie to the luxus world. Im looking to purchase an 02 supercharged is300 (61k miles), coilovers, intake, headers, exhaust, short shifter, 19 rims, lip kit, very clean leather interior, engine managment system...This car has about 25k in receipts and everything was professioanlly installed. My question is what would be a good price for this car, the guy said he would sell it to me for $20k and that seems reasoanble to me, but like I said im completely new and would appreciate some opinions. The second thing is that the cat was eliminated when the Apexi exhaust was put on and now the CEL is on and the guy said that it is just because there is no cat on the car and it messes with the O2 sensors??? does this sound right?? Thank you everyone for your time