thinking of purchasing a new exhaust for my 2010 rt 6 spd. borla exhaust s type looks good, what are the pros and cons of installing this exhaust, do I need a cold air intake? is the drone noise bad. we also have a drive clean program in Ontario for cars 7 years and older, will this effect the result of an emission test and possibly cause it to fail when the car gets older. plan on keeping the car for a while, would be a pain if it fails the emission test at the 7 year mark. any ideas would be helpful. how much of a performance gain will I get, borla says around 10 hp, is that realistic or is it just for sound.