With some curve in the runners, I have managed to get around the oil filler cap. I have a little preference for straight runners but I assume most customers would rather not have to cut off and block up the oil filler neck.
So far we fit under the strut bar even with the 3rd rail. Plenum and runner inlet shape and size will probably suffer a little to cram under it.
I have to finalize runner taper now and double check cross section area of the stock lower where it passes through the flange point. I would say finalize length... but at this point I think we will cast them really long and then we can cut them to any length we need to later. That way if we do a long runner setup we don't have to weld extensions to the runners.
Then I have to study the runners in the stock lower since they are not all equal in that part. I may end up evening it out a little in the upper... although Nissan themselves didnt feel the variance down there was worth much consideration in their own upper. So I will think about that as I pick away at this.
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