With every car I've owned, I've always had it remapped live (ones that can be) on a rolling road as it can be tailored to suit my needs per vehicle whether it be for performance, economy etc.. and I've always thought (and still fairly certain) you will get better results from a live/custom map and certainly if you have various mods/alterations. I have always been a firm believer of a 'real custom' map for a vehicle and have to admit, have frowned upon people who have a box and tried to preach to