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I just went from the JB4 to the Cobb S1 Aggressive, and I can tell its very smooth. DP and FMIC with a custom tune soon to come.
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2009 SGM 135i M-Sport
Ark l Blackline l iCarbon l AFE l Hawk l VMR l ST Coilover l Parrot Asteroid l JL Audio l Janus-Design l Reiger l BMW Performance l COBB l Evolution Raceworks l TIAL l VRSF |