Nice, I just did an InJen on my N54 equipped E93 and hearing the turbos spool when the top is down sounds awesome, now I kinda want the blow off sound too (as ricer honda as that sounds!)
FYI - write this date down - it is the first day of modding your car for the rest of your life!
2008 E93 335i, MHD, HPF IC, Injen Intake
2016 X5 M-sport 35i JB Stage 1
2013 Mercedes C63 AMG ROW airboxes, power pipe, Eurocharged V6 Flame tune 540 HP