hello, i am a new user after discovering my cam is worn to the point where exhaust is traveling back through the intake making a noise similar to a header leak. (2006 Jetta TDI) This forum has been a great help. One question; the colt cam seems like a no brainer based on prices of the OEM?? what is the difference between stage 1 and 2? I am most concerned about economy not power. I am assuming a different profile but can't seem to find any info.. Has anyone had experience with the colt cam? Any thoughts or suggestions are appreciated for a newbie.