I wonder if this addition would make any difference to change OEM T-plenum to IPD Y-plenum, especially as if I have already double free flow intake, Cup exhaust headers and lines updated, and I am getting rid of mufflers... I am going to remap ECU anyway, so why not to change one of these in same process? And should I update the pedal to wire system and then rather accept 82mm GT3 throttle body with larger IPD plenum? I don't know...
http://www.ipdplenums.com/products/plenums/carreras/996-carrera
Some story in here...
http://forums.pelicanparts.com/boxster-cayman-forum/751814-improve-performance.html
