I agree with burnttoast.. though I have used Qcarbo32 to pass, it is only a temp dilution that floods your body with the same things you can get for less money (I just spent 100 on 2 bottles.. should have read more on here first..). A lot of people llike N2's dilution sticky, but if you are short of time and def need to pass I would lean towards subbing. I have a test tomorrow, and though I haven't smoked for 10 days and exercised I am still going with a good friends donation as I want to be sure. If you are going with dilluting stock up on creatine for 24 - 48hrs before and drink some gatorade and water along with the drink that you have as long as the b vitamins are high for color (might as well use it if you already spent the money). Its always best to get an at home test, preferably with an adulteration strip included, and test at home with whatever method u choose before you put it to the real test. Good Luck!