i have recently fitted a rs 500 intercooler to my 2wd cossie , since fitting it i have got a loud chattering noise before the dump valve kicks in i was wondering if anyone has had this problem, it sounds like anti lag but its not that, it is running 19 psi of boost t34 turbo 803 greens 3 bar and 34 actuator i would be grateful for any advice cheers cosbag.