I'm interested in purchasing an 08 WRX. I found one for sale locally but have a couple of questions. The bike has an FMF silencer and the open airbox mod, but it does not have any type of fueling modification. Coming from a sportbike background (Ducati), it was common practice to install some type of fueling controller (PCIII) after increasing engine air flow or installing an exhaust. Do you have to install a PCIII after installing a silcencer on this type of bike? Should I look for another bike?