Installing greddy intake manifold rb25det
It would be easy to remove these 10mm bolts after you remove the whole assembly (with water tube) from the manifold. You can remove that or just remove the hose. There is a 10mm bolt that acts like a bracket for the vacuum hose (for the air regulator) on the manifold. It's these guys if you're still confused. NOTE: I did this part out of order, but should be done first! Off of your old intake manifold, remove the water tube that lays on the bottom with a 12mm socket.
You will need to use the two longer bolts and the shortest bolt for the intake plenum. The four bolts that are the second shortest (two sizes from the right) will be used for the throttle body if you don't have the original throttle body bolts. You can see from the photo that there are four different size of bolts. Here is the jumbled mess of bolts that come with the manifold. If you don't have a new intake manifold gasket, carefully inspect it, mine was still good so I opted in using my old one. The metal intake gasket should be changed and no seal is needed.
INSTALLING GREDDY INTAKE MANIFOLD RB25DET FREE
Make sure the area you're working on is free of clutter. Remember this? My piece of cardboard with a diagram for the bolts? Well guess what? It wont be needed unless you plan on installing the stock intake manifold, otherwise for the GReddy RB25DET Intake Plenum, it comes with a whole set of bolts. Day 6, Installation of GReddy Intake Manifold