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Optimal power range is from 3.3-4.3k for my tune engine. I normally shit at very low 6k before the PSI tapper dives.
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2008 BMW 135i ///MSport Alpine White / Taupe Leatherette
Cobb 2+ Aggressive | BMS Intake | ER Charge Pipe + Tial Q | ER FMIC | RR Downpipe | RR Exhaust | RR OCC | KWV1 | Apex ARC-8 245/18/40, 275/18/35 |