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Exhaust of your choice, ESS or Evolve Tune, Filter. This may be over budget and probably won't make more than 20 additional horsepower.
The main way to gain power is by removing the primary cats with a middle exhaust and software.
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2011 E92 Le Mans Blue M3 | 6MT | Competition Package | Black Novillo Leather | Carbon Leather Trim | Klassen M52 Monoblock 20X9ET17/11ET33 | Michelin PS2 255/305 | KW Sleeve Kit | Dinan Free-Flow & Middle Racing Exhaust | Dinan Carbon Intake | Dinan Underdrive Pulley | Evolve Tune | RPI Scoops | Challenge GT Front Lip | LUX Angel Eyes | OEM Edition Black Grills & Gills | IND Painted Reflectors & Keyhole Cover | Valentine One
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