Mods that might relate to problem:
Pettit airpump elemintor with underdrive pulleys (alternator and waterpump)
Apexi AVCR
Boost gauge with constant power wired straight to battery

Under hard throttle all the warning lights come on: Low fuel, Low oil, Low coolant, Charge Battery.

Front left abs wire was ripped during spring install and is just left hanging.

I'm thinking the AVCR might be wired in a little funky, boost gauge taking constant power, pulley dying or being underdriven, or maybe the abs wire is flapping and making connections has something to do with it.

I really doubt the avcr install. Boost gauge directly to battery + underdrive pulley sounds most likely to me but I'm horrible with electrical systems.

What do you think it sounds like?

 

If it was me, I would check that you get near 14 volts when driving full throttle. That's the easiest test to do before mucking around the connection points. Then start looking at page Z-44 in the electrical manual.

When the car is off, the boost gauge is at atmospheric. It is useless data. Why is this wired directly? Isn't it a bad drain?

My shot in the dark is: your pulley is slipping once the engine gets faster.

 

It turned out to be a loose plug to the alternator. The car felt so much better after I slammed it back in.

The constant power was so the Defi could do it's blink and full sweep before turning on. Just to be safe I pulled the wire and I'm going to wire it to either the cig lighter or splice into something else.