I am not new to tuning cars, but this is the nicest BMW I have owned.
I am looking to do some engine upgrades first. Cold Air, Intercooler, Charge Pipes, and BOV. What are the brands that everyone recommends that doesn't break the bank, but wont feel like I bought the AutoZone specials.

Also has anyone done the OLED taillight upgrades? I want to keep it mostly looking stock, no reason for an M bumper or anything yet. What are some mods you recommend?