Not fussed stage 3 or 3.5

[andrewt1971]

.people have been known to fit them, hate it and revert back to a standard inlet


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Yep, been there, done that. I honestly believe that for a pure road car stage 2 is enough.

[VeXeR]

There's a different way around the inlet;

Get a water-meth kit installed.
Cool the air, increase the air density, feed in more oxygen and also increase resistance to knock.