Actually I'm considering DP or MP because some people said doing only axle back will not give significant changes in the sound itself and that's why I'm asking here. So, in other words by changing my DP, I will fail the smog test? How about Mid Pipe? I just want to make sure that I'm not wasting my money for an axle back if in fact by changing my mid or down and using stock axle back will create better sound.
2011 JB E82 135i - Premium pack | Value pack | Premium sound | Sport pack | M-Sport steering wheel and suspension | Blackline LCI tail | BMWP carbon spoiler | BMWP CF license frame | BMWP gloss black grilles | Meisterschaft GT w/gloss black tips | CF diffuser | CF splitters | Hyper Black Apex Arc-8 w/Potenza RE-11 | Dinan camber plates