Performance-wise, I have hardly noticed anything, he was compared to the now cleaned LMM only minimal support as I afterwards realize.
Only the fuel consumption, according to the MFA was to work on intake increases by 1-2 liters of what drew my attention to the LMM.
It started during my last "defective LMM" also. Changed Lufi and LMM filthy. At that time I had no idea and just bought new NEN stubborn.
Buy yourself everything with increasing fuel consumption / incipient sacrificing performance or prevention for work before and after the LMM simply a box and within a few minutes again just like a new LMM - provided that it is not due to dirty injectors or the like
The few euros, it has been my opinion really worth :)