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Drew you are correct about the filter changing boost without changing the pulley. My first upgrade to my old GT500 was an intake and made 1.3psi more with ZERO changes to the pulley. I'm sure it would have made additional boost if we had removed the filter and performed another run.
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2009 E92 M3/DCT/Alpine White/Fox Red/Carbon Leather
OE Tuned 402 whp & 303 wtq/Gintani X-pipe/MXP Axle Back/Rogue Pulley/AFE Stage 2/Cosmetics By IND & EAS
HUGE THANKS: Gintani, OE Tuning, and EAS |