Well fastchip sell the maps and the RSTuner modules, its pretty straight forward to apply to the car if you have a laptop but definitely worth following the guide on here. The pops and bangs map is the overrun map that fastchip can supply, basically it over fuels the engine to make it pop and bang, you can also get it to spit flames if you decat your exhaust but like i said the RSTuner i have for sale cannot apply the overrun map. There is no 'chip' to buy lke some other cars, its simply a different map you upload to your ecu.