search, most go with fi or berk, cel free for the most part, 5k + have been reported with no cel, everyone notices a diff, most agree its the best bang for your buck, good mod but expect a drastic increase in exhaust note along with some rasp esp when its cold.
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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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