chips are just about worthless, they set a fixed fuel map for ur car which isnt good under all conditions, if u want ur ecu set agressively pull the hazard fuse or disconnect the battery and the first few times u drive it afterwards floor it, and ur cars ecu will learn ur driving pattens and set the ecu's map for them. chips just lock in a map for everything which defeats the purpose of an ecu which can change fuel maps under different driving conditions. hope that makes sense