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UPDATE: After about 2 weeks with the Helene filter, I am surprised to find out that the car pulls noticeably faster in 2nd gear especially after hitting 3000RPM ! Pulls really nice, if you ask me I would say its about 10-12hp more, but don't take my word for this. Last few days I found myself wondering every day "what the hell is happening, the car pulls better or is it in my mind ?". I never asked myself this before, so I suppose it is because the filter. The gas is the same as before, I use mostly 93 octane.
I am planning to do some dyno pulls in a few days with stock filter, helene filter, BMW Performance Power Kit+stock filter and Power Kit+Helene filter (I plan to order the kit in a few days).
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