you dont want to get rid of your oem catch can. what you want to do is bore out the 2 holes in the top of it. then run your vent from your valve cover down into one and run a line out and to the ground for the other. then put a vac cap on the im outlet port. that way there will be a neutralized balance of crankcase pressure and atmospheric pressure and it will basically be the same thing as when people have their valve covers vented with AN fittings. your version will be 30 times cheaper and not as much work. and for your power levels, it will be more than sufficient.