I duno really iv never had it done to any cars and spoke to a few people and got a wide cross section of answers from people who have had it done petrol heads who know alot more than me so I figured I ask on hear and see if it had been done before. Iv Fitted a KnN induction kit and had the exhaust done both made a noticable improvement, a couple of people have said to me that a remap would allow the engine to work better with these mods but I do believe in doing my research.