The Corolla G6 gearbox is a good upgrade but pretty expensive. They're 6 speed but I think the first 2 ratios are the same. Check the Classifields, theres one up F/S now. As for the intake, the Corolla inlet manifold is a really good upgrade. Found in the 4EFE Corolla 98 onwards You could relocate your filter to stop heat soak which may affect performance that little bit, and a custom made de-cat pipe would allow the engine to breathe better too. Also, you've posted in the wrong section!