Does anyone upgrade the BRM intake manifold?

I have a BRM with a malone stage and the EGR rattled loose and fell off .

I know next step would be pd150 turbo. I keep seeing PD150 intakes. It seems everyone puts these on a ALH though. Can someone explain if its beneficial for a PD105 BRM or if it even fits?

It would fit, but no benefit over the BRM manifold, they are very similar to begin with. If you want to get rid of the EGR valve altogether, Darkside makes a nifty piece to delete it while retaining the ASV.