BoostJunkieInTheMaking04

Hi everyone, First time post. I'm in the market for a XR6turbo. Ive sourced out a 2004 BA XR6T 5 Speed Manual. 150000kms. Has leather, Premium Sound. full electrics etc. What type of price should I be going for? they want 11,500? Is that too much? What are the things to look out for when buying one of these? Any other things I should know about these cars before I jump into one? Thanks heaps