I did it without removing the intake. The key was to cut down the hex wrench shorter so it fits under the fuel rails. Also, if you notice, the hex heads are square faced, meaning the wrench must fit exactly in the hole to turn. Normal ones have slightly rounded edges, which effectively makes the hole a little larger, which in turn guides the hex wrench in. Basically, without the rounded edges, it took 10 tries to get the key into the head, only to turn it a quarter turn. My solution was to slightly round off the edges of the hex key to make it easier. If you have no idea what I am talking about, look at the hex bolts you take off of the stock regulator and compare them to the new ones you should get with your new regulator.