The ARM F80 M3 Charge Pipes allow you to maximize power on your M3 by securing all the boost that your S55 is making.  The stock S55 charge pipes are notorious for developing hairline fractures at their plastic seams.  These fractures or cracks are unnoticeable to the naked eye, but under boost pressure they open up leaking the desired charged air into the engine bay, and consequently can rob your S55 of it's full power potential.  In addition, these leaks can trigger your S55's turbochargers to work harder to hit and maintain target boost pressure, potentially wearing them out sooner.  The ARM F80 M3 Charge Pipes replace the OEM plastic S55 charge pipes, ensuring that all of your charged air makes the transition from the turbos to the intercooler.