Yep, I already know about the loss I'll have to take in mounting it in the rear, but like I said, I don't really have much choice because I have to keep A/C and fans. I've even thought about remounting the A/C unit in the rear, but that seemed to be even more trouble, and cooling would be a definite issue. I don't think the loss will be as big as people make it out to sound though, as it will be only another maybe four to five feet of pipe. With a good design on the header and the least amount of curves (and there should not be much), I think the flow can be kept pretty good. Design will be key to overcome the length issue; kind of like the difference with a log style and a tubular style turbo header. The log is obviously shorter, but yet it does not perform as well as a tubular design. Add to that 4-2-1 bonus, and I think it will be okay. Bottom line again is that I just don't really have much choice.
I have a solid platform to start with, as phase 1 of my project was a bottom end rebuild, so I am using forged internals, copper gasket, and studs. I've measured it at the junkyard, and I'm pretty sure I can get a DSM SMIC in my front fenderwell for initial cooling. I'm toying with some other cooling ideas for later , but it should be enough for starters.
I've briefly looked into the Megasquirt, but I will research it some more. Again, all that will depend on the sucess of the OBD conversion, as I want this to be completely street legal.
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