Under load is pretty much while driving, engine pulling weight vs free rev. Definitely let us know the before and after feel with the coils, I was thinking of that for a future mod myself. Maybe after that you can try some mustang injectors! They are supposed to make a noticeable difference.

Mustangs Fuel Injectors Are Awsome! [Archive] - Bimmerforums - The Ultimate BMW Forum

http://www.fiveomotorsport.com/fuel-...rs/bmw/?v=6771

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