at rx7trix.com i found an hks t04r kit for a good price. but next to the kit's information it says something about a intake manifold modification that is required. what on earth is this mod that needs to be done supposedly?

 

This was made for a jspec rx7 and they dont use a egr and our rx7's have egr valves so the get in the why of the turbo.I didn't know how to midify it so i used the jdm lower intake manifold.