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.
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
DDM 55w 5000k HIDs and DDM 35w 3000k HID fogs, COBB shifter weight, BC Coilovers w/ Eibach rear Camber Kit, 18x8 +35 RPF1 245/40 re760 Potenza, HKS TT Type 0. MOCCFORUMSCalifornia Mazda forum