Step 5: The cat bypass should have come with a set of 6 stainless steel nuts and bolts. In my case I replaced the nuts with the KatKit as I find them easier to work with under the car. Offer up the bypass tube, sandwiching a gasket at each end and bolt it into position using the ratchet and 17mm spanner. I always orientate the bolts so that the nuts face outwards as this makes future access easier. Ensure that each nut and bolt is fully tightened. (Picture 6)

Step 6: Jack the car off of the axle stands, remove them and then gently lower the car to the ground. Remove the jack and the piece of wood from the front wheel(s).