My philosophy has always been run the smallest turbo that will do the job. Sure spool isn't the biggest concern with drag but you still want a fat mid range, going to big may give you the peak number you want but your mid range will suffer.
Far to often guys build there car for some "down the road" scenario that never comes together. I have been developing my car on a turbo that most said was to small, gets no bar stool attention. However anyone who has been involved has just been blown away at what has come out of it.
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