The MD GM trucks from 04.5 to 08 when they stopped making them had the LLY engine. Though in 06 the LLY was really a LBZ with a different tune on it. So that 06 will not have any problems whatso ever. LLY's had some headgasket issues, but in 06 they changed gaskets and turbos which solved the issue. The MD trucks also only came with the 6 speed Ally, good for you. The 6 speed is wonderful. Only thing you have to do with this truck is add fuel and change the oil. Nothing else is needed with these, although a turbo brake would be a good addition. EFI Live is the ONLY way to go. I would just add a turbo brake to the stock tune and call it good, no need for anymore power in one of these trucks.
