Pictures of my MazdaRX8 Slant project

As far as weight goes, when you remove the oil coolers, all kinds of things specific to the rotary, (I have a crate full of plastic and other parts no longer needed) move the battery to the trunk, and replace an electric rack with a hydraulic rack it is nearly a wash. The late model slant is considerably lighter than the earlier models. Remember, the starter is no longer on the engine, but on the transmission. The Dutra Duals weigh the same as the stock manifold.