One way to think about it is who has the fastest 1/4 mile times. The top all have Inject Long tube Intake.
CAI and Vararam also have shown good improvements and would also be considered the top tier. I have (currently) the RotoFab and it gave a noticeable improvement.
Those are the 4 that seem to be the most popular.
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Midnight => 2011 1LT/RS, A6, Roto-Fab CAI & W/W Relocate, MPD Hood, 25%/18% Carbon Tint
See my build journal here.
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