before you get into DP's... invest on HPFP first then AP. The AP will allow you to monitor your engine and tune ^like what Mike said above. Also, don't worry about the CEL. Any DP you put, you'll get a CEL. The AP can eliminate that.
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2010 BM MS3 - Cobb AP,ETS TMIC, Autotech HPFP internals, Forge BPV, Denso Iridium ITV22, CP-E SRI, PG TIP, SU RMM, TurboXS DP, TP, ARK Exhaust, NRG ETD, 30% e85 mix tuned 346hp 392tq of sexyness
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