I currently have a msp with 102,xxx its my daily driver, just put in a new welded lsd, clutch some axles, all the motor mounts and tranny mount. its ready to go again, since I snapped my previous lsd. I have a cai (rigged) still has plastic piping just the kid before me slapped a filter on and took out air box and all. I want to run 9psi on it, and my plans for supporting mods are as followed in order. ebay fmic kit, split second afc, wastegate with spring (not sure on brand, will have a little stiffer spring) ebc, then I want to up the boost to 9 psi. I have a exhaust, no j pipe or s pipe nor a down pipe, is this really a must? and if I am running 9 psi will I need a aem uego wideband 02 sensor?? or is that mainly just safety precautions/ im new and ive been reading up a lot and I appreciate any knowledge you would share with me