...im not sure uf they changed anything from 00 to 01, but are the intake manifolds the same, and if not, will it still fit my 4th gen?

 

Read up on this swap in the All Motor forum. Note: I said read, don't ask them this question since it's been covered many, many times. There is a load of info in the stickies in the All Motor forums. Just letting know, if you do ask that same question, you're going to get flamed by the AM crew.

In short, it can be swapped, but requires customization depending on the "route" of installation you take. It is not just replacing the IM...

And I'm sure you're well versed with the performance effects of this swap since you are asking...