Jim Wolfe ECU is 595 and he recommends retaining an AFM, but using a higher flow unit for 300+ hp. This would put the system at 850. What is the cost of the SDS? Of course the SDS is programmable, but I perfer something even simpler than the wiring job versions. Would I really miss the versatility of the Tech II, SDS type of unit? Any thoughts on other things I may want to consider?