we all know the Z1 modified oem intake produce gain...
but what we will never know is, if there was in Fact any gain relied to your polish of your lower intake ....
unless you get another OEM unmodified and test it back to back on the dyno with the only part being changed
because the way you are mentioning is you all did that together
a placebo effect is soo each easy to feel without knowing it.
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