Just wondering why no body has done any kind of mode to do with pulleys kits ? Was a very popular mode on the previous generation m52 in the E36 328's etc
No proper power gain, just transient gains due to less accelerating mass.
Dinan recommend (as do many other experts) not removing the harmonic damper as they are needed for engine longevity... try search for Dinan and harmonic damper (on google) and you should find some good info