Save your money. I'm a complete tard when it comes to this stuff but with the help of a little thing called YouTube, I was able to DIY all of those mods. If I can, you can too.
Plus, it is satisfying.
2011 E93 - Space Gray - 6MT/Silver Novillo/
OE Tuning/Gruppe M Intake/ACS Springs/Vorsteiner CF Type I Rear Diffuser/Textured Matte Black Custom Powdercoated OEM 359s/Painted Reflectors/Matte Grille, Hood Vents and Side Markers/Arqray Race Exhaust/MS Pulley