I am sure this thread may have been addressed before here......but I can not find it. I have a 2005 749S and would like to do a Termi 1/2 system (too broke for a full system...may be too broke for a 1/2 system...anyone have a used one??) and was wondering if the air filter and new ECU (or power commander) is really required. My dealer says yes, but it seems like other people have done it without making the change. Anyone know someone who is selling a 1/2 or full system?