Originally Posted by Moosetang

From a production and do-it-yourself standpoint we're talking parallel twin-turbo. You use two identical small(ish) turbochargers (one for each exhaust bank on the V) which spool up faster than one large (cutting down lag), while still producing alot of power by their combined action. Add in modern turbo tech like variable geometry and you can have a pretty devasating setup with minimal complexity.

Sequential Twin-turbos use a two-stage setup where one small turbo runs all the time and a second only kicks in at high RPM for top-end. Problem is that you have to plumb all your exhaust through both, which is a minor nightmare. Racing machines and exotic can pull that off, but not regular production cars or home conversions.

Originally Posted by hi5.0

RX-7's (FD) had a sequential twin turbo system - which was a nightmare when things went wrong. I'm guessing the last-gen TT Supras had a similar setup.

But, turbo FTW!