i was watching tv the other day and heard them talking about variable geometry turbos, y dont we use em i mean they supposedly have no boost lag.

 

Havent learned much about them, but I can tell you this.... there are none on the aftermarket market.

 

it's hard enough for aftermarket vendors to get us to spring for the cost of a regular turbo. Something new like that, with needing lots of money to cover the R&D would cost so much I can say almost no one would be buying one for many years.