Thanks for all the feedback.Just for the info the initial power and smoothness of the twin plugging was very noticable and welcomed(and that is before the timing changes).Not sure how its affected the fuel consumption yet but I'm told it'll be better.The boxer now feels closer to a Japanese 4 cylinder but just a word of warning: After recieving my heads back from the BMW workshop(no names)I realized that one of the heads was quite obviously not mine due to the fact it was covered in a grime as if it had stood for years.The best the company could do was to clean it up and check the valves.As you can imagine now I feel a little concerned that I am running a substandard part. So needless to say if you are posting of your heads just make sure you comprehensibly mark each one and go out of your way to also make sure the engineers KNOW you've done it and for what reason and hopefully you'll get yours back.Good luck Jem.
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