I have read a lot about these additions to the vehicle I have (RC Colorado 2011) and it appears that if wanting to reduce buildup of carbon on exhaust port and EGR valve, they are a good idea. Also, the thought of directing oily fumes directly onto the turbo does not sound like a good idea. There is also the matter of blanking off the exhaust port for the EGR and the issues of legality and warning light coming on indicating fault when vehicle goes in for service. As I intend to hang onto this reliable tug for sometime, I would appreciate any feed back from members on this subject. Electrics/solar may be my stronger suit, but this is all new ground for me as this is first diesel vehicle i have owned. Can anyone help/advise?/