LS4 / F40 swap - fieroguru (Page 210/210) Bob2112 JUL 07, 12:11 AM Thanks for much for posting all of this. I probably won't be using Haltech now that I've spent a lot of time learning MegaSquirt on my Mustang. But, the logic should be very similar for other systems. This should be a huge help to me and I'm sure several others. Great work as always! And I'd be in that small market for your mechanical water pump solution for the LS4.