You will need to keep using the FMU with 38lb inj. When you go to 42lb inj and up you can get rid of the FMU. But then you need a way to drive the inj harder if more fuel is needed at full boost. The FMU can get a little fussy at times. You will usually get a sudden jump in fuel pressure once boost comes in. As far as the T-Rex goes I would listen to Rick at AFM and put it in. You can watch a fuel pressure gauge with and without it. If you start losing fuel at mid track you will need the assistance of an additional fuel pump. I think in your body style you can mount the ign box on the bulkhead(firewall). Otherwise inside the car under the drivers seat works to just make sure you have clean and tight connections when doing so. Also I noticed you are using a kirban fuel pressure reg. The unit will go 1:1 under boost. Meaning for every lb of boost it should raise fuel pressure by 1lb.
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