i have the stock 3 post, but i bought a 94spoiler and im planning on getting the spoiler posts. it will be a hard install tho, because the posts dont line right up on a 98.
The top scoop part is. Has side screws that you can pop out and decline or recline. I can't see it making much difference though unless you're competing for land speed records >> I think the degree that it moves is only a fraction up or down.