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Message: <blockquote data-quote="kevster30" data-source="post: 382344" data-attributes="member: 10">In my experience, the factory headers have been fastidiously tuned by the engineers to give you, the consumer the best balance of up and torque. Not to mention best fuel economy. These headers are extensively bench tested in Bmw's labs. By going to aftermarket systems, you will be altering the airflow through your engine. As your original engine's software was programmer to work with a factory fitted header, do you really think that this is the optimum thing to do?Do yourself a favor by going for software tuning if you lust for power. Exhaust work only benefits you if the internals of your engine have been fettled with. Hope this helps.</blockquote>