If you get under the truck on the driver's side, head toward the front, if you look up the side of the motor, you will see the manifold. You will see a 90 bend that goes up closest to you. You want to put the pyro just before that. You dont have to take anything apart. Just drill it nice and slow, grease your drill bit and your tap. Take your time, use pleanty of grease and re-grease several times to be sure and catch all the shavings. Once you have it tapped, take a pocket magnet (I used the telescoping type) and put it up in the hole and get any extra shavings. I have also heard several guys that use their shop vac while drilling an tapping also. Dont go over 1250* for more than 12 seconds or so, and if you want the best fuel economy, stay below 550*. Hope this helps, any more questions, just ask away.