Thanks for the article, very informative.

I am not going to change the exhaust system front to back. I like the Dinan exhaust as is. If I install the cutoffs it will be only when I use nitrous, yes I am the fool with 150 shot of nitrous, so the best place to potentially get that amount of flow out should be at the point the primary pipe turns toward the back of the X though I will check and will shoot for 17" from where the 'collector' starts. I am on vacation so I can't look at my exhaust. If I were to guess I don't think I have an X pipe. If I don't I will add it as per the article it won't result in a decrease and 60% of the time it will be an increase.

Sound like the best plan based on the parameters or do you think I am I way off base?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas