OK thanks Chris, seems that noone is really clued up on them at all. Shift lamp is obvious enough, timing signal from ecu and adjustable led lighting point. I actually quite like it, set around 5.5k atm. All I can assume is that the other box is the de-limiter, and there's no way that's coming out!!
By the way Chris, the car now makes 1.0bar w/o b.controller (0.7 before). The "tinkle tinkle" sound (under boost) has gone (loose bits in cat), the exhaust is considerably louder and so is the turbo spooling sound.
I think those ceramic bits and the cat itself were a major restriction as car now flies up the rev range and genuinely feels quicker than before. I am comparig 1.0bar with bc off to a "forced" 1.15bar with bc on and cat in. I'm convinced this is quicker and more powerful and considerably less boost.
Much appreciated.
Brakes are still squeaking tho (front and rear) any ideas?