Another thing to consider is expected power output versus how you want the power to come on. For up to 550-600 FWHP you can use a smaller single turbo and not have too bad of a boost lag. If you are looking at a higher HP setup, the larger single turbos will make good power but generally have to get up a bit in the RPM to build boost. If going to a twin setup, you can use smaller turbos and a lot quiker spool and better low end torque.
To give an example, I have had 575 RWHP single turbos that peak boost and torque hits at 4500-5000. A similar setup but with twins hits full boost and torque by 3000-3500, pretty much make 150-250 more foot pounds of torque with a properly packaged twin setp over a single in the 2500-3500 RPM area.
As mentioned a twin setp is about twice as many parts and therfore getting close to twice the cost. Hope this helps.
Mike Norris
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