I plan on getting one of those Clippard Mouse valves to use with my spare Adaptronic PWM output also. I'm not going individual runner though like you. Should still provide for some nice accurate, progressive WI though.

1. you are the only person on this board who cares
2. anyone selling IRTBs for Miatas should be steered well clear of

I may be the only one who cares about the distinction between knowledgable and prat but then again I'd rather have someone knowledgable helping me.

Anyone selling IRTBs as a cheap power upgrade should be steered clear of yes. FujiRacing proved they provide better performance over a 1/4 mile with their comparison between 240 turbo, 220 super and 150 IRTB car. I'm not sure as to the specifics of the runs as they were never divulged but I suspect the IRTB car was drag raidals and prep'd but still thats no mean feat.
Oh and given they are by far the best way of controlling the air going into the engine I'm still not sure why this isn't a massively popular idea. Ive only found 2 IRTB + FI cars but know of another one here besides me but they are going super.

I run a 220 whp turbo car. Show me a 150bhp IRTB'd miata that runs 12's on street tyres ...

Which one was Hyper driving?

I believe the times were all in the 13s but its their site not mine and lets face it they have had BS call outs before and had to retract. Still they autocross and crap and run faster than many but is that driver ability