There is no JB4 for the F30 yet. Only the N55 Stage1 tune. It does not leave codes behind but if you are worried they sell a complain tool called the "CAN Tool" that will delete hidden codes. Alternatively you can get the BT Tool which lets you read codes via laptop from all modules on the vehicle.
Gains are 40-50hp and well worth the 5 minute install time.
MARCH MADNESS - CLICK HERE For ALL CRAZY SALES
N54 Catless Downpipes - 329.00 Shipped!! ar design downpipes 15% OFF (including Free Ship) Evolution Racewerks FMIC, DP and Oil Coolers @ 15% OFF + FREE SHIP - WAGNER FMIC and DOWNPIPES - PM FOR INFO!