Exhaust primaries are easier to fit before fitting the steering column.
Make sure that the outside of the car is protected, then unscrew the bolts and remove tape and gasket from the RHS of the engine
Now you need to prep the springs, which is a little bit painful. The springs are reverse springs, so as you compress the spring, it will allow the two clamp ends to move further apart. These are to snap over the two hooks, one from the primary and one from the collector and hold the collector in place. The best way to compress this spring is by using zip ties. Start with one zip tie, pull it tight, then add a second one and pull tight. Repeat this with 4 or 5 zip ties, tightening each one slightly each time, until the spring is fully compressed. Then remove the clamps from the springs and stretch them out – this will buy you a valuable few mm when fitting them over the hooks (like everything else, it barely fits!).
Now feed through the exhaust primaries one by one. Start at the front, and work your way backwards – only one primary will fit one slot, it should be fairly easy to work out which one is which. Take your time, there is enough space to fit them through. Feed them in from the outside. As you go, loosely bolt them on, be careful not to let the primaries rest on bodywork if possible. Once you have all four in place, give it a few turns on socket, enough to stop them falling off, but leave plenty of give at the end for getting the cat on.
Get the collector and slide it on. Be careful with orientation, the lambda probe (hole) should be on the bottom nearest the driver. Make sure you have the collector all the way on, torque up the primaries to the engine.
Now you need to fit the springs to secure the collector to the primaries. You will see why it is best to widen out the clamps first. Get the springs into position, by getting the clamp over one hook, then pull the other end over the other hook. You may need to use some pliers to help get the clamp over the hook. Then cut the hardest to access zip ties first and it the spring will loosen, tightening the connection.
Now take the lambda probe (comes as part of the exhaust bag) and insert into the collector and tighten. Run the cable from the lambda probe under the driver footwell, securing with stick on cradle clips and secure to the socket from the wiring harness, again with zip ties.
Final pic :