Jibby, I appreciate your candor...But to call Twins a crock, is a bit far stepped...
You have asked a good question. Twin Turbos will tend to deliver more boost at lower engine speeds and a single will tend to move more air at the top end.
I did a search on the web, and it appears to be a consistent debate as to which is better. I believe the best answer is not twin or single, but how well the whole turbo system is designed and matched with the engine it is mated to. A properly balanced system seems to be best.
Here is what Wikipedia has to say:
"Other setups, most notably in
V-type engines, utilize two identically-sized but smaller turbos, each fed by a separate set of exhaust streams from the engine. The two smaller turbos produce the same (or more) aggregate amount of boost as a larger single turbo, but since they are smaller they reach their optimal RPM, and thus optimal boost delivery, faster. Such an arrangement of turbos is typically referred to as a
parallel twin-turbo system."
From my limited experience, and the general consensus I am concluding that twins will probably get you to your power band quicker, and with less boost. So, perhaps twins are a bit more efficient, in that regard.
The debate will rage on...:slomo:
Ryan
So basically twins are a crock and basically overkill on a street rod..More piping, money, more headaches, which means more that can go wrong, more intercooling needed, etc... And in the end it probably won't out perform a good fitted single turbo by much if any at all.....
So why would anyone in their right mind go for twins on a street rod? Ryan? Anyone? For bling bling and just because I can maybe? Fitment problems...
I thought they might compliment each side of the motor better and offer a broader band of power..More lowend and topend power throughout with the twins...I guess that line of thinking is a complete farse.
) the variables are so many and varied for a street car that either setup will do an adequate job. If you can fit twins and have the dollars then do that as a preference but if you can't then a single will also produce an excellent result. 
