Sorry to get off toic here guys but unless you're just trying to squeeze every little ounce of hp/tq out of your setup then changing manifolds really doesn't make much since(if this is just your daily driver)..im my opinion and in my opinion only it makes since to go with a fast 90 combo if you're doing a max effort build and money really is no object however the mods that you've listed say that you're budget minded like most of us out here..if you really want it and can afford it get it but obviously you know the money can be better spent elsewhere and I'm sure you don't need anyone telling you that besides youre making great power with your current setup..the builds that see gains from a fast 90 setup are usually going to be your larger cube/ larger heads&cam cars with better flowing headers and exhaust setups....at the end of the day though if you wait around I am sure you could pick up someone else's used combo but for a budget build it really not worth it..just my .02