I've been reading a lot of posts about the stage 2 AP. I have a 04 WRX with a Helix catted dp and a Borla Hush. Is it safe to use a stage 2 map on my car? A salesperson in Harman Motive in Torrance, CA told me that it isn't safe until I get an Uppipe. (I got my AP from them) What do you guys think? Thanks.