Alright so I did some searching but couldn't find much info. I'm having wg rattle and smoke so I'm going to be choosing a single turbo setup. Do I need a PI or upgraded hpfp/lpfp? Only going for ~550hp. I have an '07 335i with the following mods: BMS DP BMS DCI Magnaflow exhaust Jb4 ER Chargepipe w/Tial BOV VRSF 7.5" FMIC (ordering soon) Thanks!