I had only the Catback Rpi GTC during the break in period, it didnt sound as good and deep as when i had the RPi xpipe installed! Just a tip, learn to drive like a grandma on the streets, listen for the engine load and correct shift points thats how i control the exhaust loudness. As per the morning start up and smell, its the price you pay for what you got my friend. The cold start you can eliminate with a tune.
2012 M3 e92
LeMans Blue, RPi GTC full race system, RPi scoops, BMW performance decklid, GTS wheels, OEM gloss blk mirrors ...