Which one is best depends on how much money you plan to spend... And how you plan to drive it...
The SR redtop has the better flowing head and will make more power in the end when modded. Especially if you upgrade the turbo.
The SR blacktop has a little better turbo stock, biut does not have as good of a head. If you are leaving it stock, this is the way to go.
What do you want to know about the RB20DET? It costs about half as much as the SR and mod for mod will outperform the SR. It also doesn't have the valvetrain falling apart problems like the SR.
I'm about to walk out the door, to participate the drift event in Atlanta this weekend. I'll be back some time Sunday
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