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If you stay in the 5 to 7psi range, you SHOULD be able to get away with the stock injectors and just an FMU. Its a very cheap way to get it done, but it works. I've seen as high as 10psi on a GT32 with stock injectors and an FMU. It netted 240whp. The stock MAF has been proven to be good right up through about 270 to 280whp.
If you want the extra bit of reliablity, then you can go with the 370cc injectors, new fuel pump, and S-AFC. Then you should be able to run a full 10psi and be real happy.
JWT makes an ECU reflash for right around $600 to run 370cc injectors, so you could go that route without the S-AFC. I'd still get the upgraded fuel pump if you go with bigger injectors.
And, finally, the most expensive, but the most reliable solution would be to go with the JWT ECU reflash, the 370cc injectors, the new fuel pump, AND the S-AFC. This would take care of your timing and you could make minor tweaks to compensate for all the different components making up your setup.
Anyway, good luck! Can't wait to see another KA-T on the road.
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