I relo'd my battery to the trunk to make room for an intake. The install isn't bad, but you do lose trunk space. I finally found a smaller battery box, which minimizes the effect, but forget about hauling chairs and bookcases in the hatchback.
The weight distribution improved a lot. Some of the sluggishness in the rear-end disappeared.
The real benefit, though, was more room to play with intake designs. I have a Rev A (early 1997 model) with the evap cannister blocking the good CAI locations
I plan on building a box on that "shelf" in the engine bay to house the filter and draw only cold air from the fender and behind the headlamp.
As for tapered designs, didn't Red or Random play around with one of those about a year back? I remember it looked funny but supposedly had good surge/shifting response.
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