That's up to you. Personally I am glad I have an LB7 right now because there are no power adders for the LLY yet. If you want to drive it into the ground you might want to get an LLY. The injectors are easier to change and it could quite likely be an issue down the road.
I have one of the last LB7's and although it's not the new design with the injector return lines on the outside of the valve covers, it also does not have a CAT or EGR. That was pretty important to me.
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