Hey I was just wondering what is your favorite tip to use when cleaning exhaust systems? 15,25,45 or a turbo tip? and what situations you would use them in. I usally use a 25 for most things but on occasion I will change to a 15. I don't know but think a turbo might speed up the cleaning process don't you. I have opnly been doing this for a few months so I am still learning.