DIESEL FREAKS PERFORMANCE HARNESSES

I run a set of these on my 2007 C13 turned to 470hp and it works great. I gained about .2/mpg pulling 90,000# and the biggest improvement was the throttle response. I have had them on since August and have not had any problems with them. I have the adjustable boost dial and run it on #5 all the time. It does smoke more but I don't worry about that too much. For the money they have more than payed for themselves, I've wasted more money and gained less results on other things.

Look up www.dieselfreak.com. They are available for most Cat and Cummins, you can check your engine serial number on their site. Cost is $189 plus shipping.

Depending on color,not really a good thing..Black is unburned fuel..Do elaborate Jeff.

Black exhaust smoke usually means that the misture is lean. Black smoke is carbon (soot). White or milky colored smoke is a rich mixture (unburned fuel going up the stack). Take a look at the tractor and truck pulling events on RFDTV sometime. You will see the white smoke pouring out the stacks because those folks don't care a wit about mileage. They turn the fuel pumps up all the way until some of it is being wasted a blown out the stack. At that point more fuel is pointless. The engine that runs too lean will usually run too hot and will (if left too lean) over heat and or turn its lube oil (crank case) to tar and at some point fail. Clear clean exhaust is what you should strive for. In certain states trucks are subjected to an exhaust scan and as it is weighed, it it is smoking it will be pulled over for an inspection by the Po lice.

i dont care how much it smokes. i just wanted to know if this harness worked and would help my cat 3406e. when i stand on it i actually hope it smokes like a freight train that way i know its workin!!!!!!!!!!!