Offering the following as a combo package ($950 now $900) or individually priced components for your 2015+ F56 S or JCW (no base or 4-dr). I'll offer discounts for those interested in multiple items.

Altogether this should add approximately 61 hp to an S (189 hp to 250hp) or 59hp to JCW (231 to 290). I know I'll get comments on that, so here's how I did the math. The Dinan map is reported to add 58 HP. The Racing Dynamics downpipe opens the turbo outlet from the stock diameter of 2.5" (65mm) to 2.75" (70mm). The oem exhaust for the S is also 2.5" (65mm). This customized JCW exhaust I'm offering has the larger 2 3/4" (70mm) diameter and also eliminates any blockage from the secondary cat. The smaller resonator makes it louder but still cuts drone at highway speeds. The end results is lots of pops and gurgles without being obnoxiously loud or monotonous. The Mishimoto CAI also pulls in more air that the stock filter box. You can definitely hear more turbo flutter during acceleration. All this increased throughput theoretically should add a conservative 1-3 HP on top of the Dinan map. Add a bigger intercooler to this package and you're going to have increased performance greatly.

Originally paid north of $2k for all this, but I'm offering it for $950 $900 because I really can't ship the exhaust and I want someone to take them all together. I'm located in NYC and willing to deliver in the tri-state area (within reason).

Also willing to trade for big brakes or coilovers.

Here's a vid with sound so you can hear the Mishimoto/Racing Dynamics/JCW Exhaust combo in all its glory. -
I only had time to record a short trip around my neighborhood and really couldn't open it up, but you should get a sense of sound. This is in sports mode. Going to mid reduces the pops so you do have the option to quiet it down when you need to. Let me know if you have questions.