The Bosio's are not as well done as the factory Bosch's. They lack a pre-ignition hole, or something to that effect which in theory causes a bit rougher idle and noise compared to a "proper" German set of new Bosch's. That said they are generally considered much better then the Indian Bosch's and they usually run much better then a worn set that was installed at the factory.

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section