Hello, since I am currently working on my Fat Boy Bj.: 99 (Evo) with my original carburetor (with Dyna-Jet) adjustment problems, I am considering whether I will save myself the next working hours for adjustment work and add the Mikuni HSR 42. Does this bring a noticeable improvement? Do you really want to keep the original filter for optical reasons (and because of the coal). What do you mean??? Or can you get a good performance from my carburetor and save money? Thank you, Thomas.