lots of posts on how to do the mod. Really pretty easy after going to lowe's and finding PVC caps that fit
I was actually going to do the same, but just use a replacement pipe. This may be my route now.
I think his must be an earlier 3rd gen, I heard they changed intake designs or something. I know mine has a small elbow tube/gasket/hose that goes from throttle body to the box, not one long continuous piece like his.