will a itr spoilier fit my 00 si i know its taller than the si same style though any help?

 

Yes an itr spoiler is taller than an si spoiler other than that its pretty much identical, as for if it will mount exactly the same I couldnt tell you but it cant be much different
As for why you would want to do this I dont know,personally leave the itr spoilers to the itr's..