.4 out of a n/a tune is as good of a gain as you could ever expect. I wouldn't of returned it.
My best Time in my 6sp 12.92 was done on open diff. Lol
Seems base models always go .1-.2 quicker
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09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)
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