I have had very good luck so far with my AIRDOG 150 W/tank pick-up, It will keep up with the biggest of tunes and you can not hear it running once the truck starts. I bought mine from Kyle at Extreme Diesel and I had 4 extra fittings, it seems the biggest complaint so far is a missing fitting or two but if you buy from kyle he will make surre you get everything needed for the install. As far as the instructions they are pretty general but if you are semi mechanically inclined you will not have any problem with them. My only complaint with the Airdog system was the mounting possition they recomend. They have the system mounted perpendicular to the frame and the mount can be seen because it hangs about 3/4" lower then the frame rail. I mounted mine paralell with the frame, It took some cutting and welding but it was not bad and its alot cleaner looking and also less likely to get hung up on something if you are off roading. You could also simply heat the mount up and bend it strait for the same effect if you do not want to do any welding but you will still see the mount under the frame rail if you look. I have pics of the kit and install if anyone would like to see them let me know.