[My E90]

I think most of today's cars have a dual-mass flywheel. It helps to keep the chatter down and absorb vibration. The 1M's unit is just a lighter weight version and shouldn't have a problem taking on additional torque.

You've got to have a very understanding service department to get a way with a warranty issue like a HPFP failure or any engine related problem with aftermarket downpipes installed. Normally, changing anything with a sensor in it or having an affect on a sensor is a no-no.