i've had the weighted zhp knob in several of my prior BMW's. they are great! i ordered one for my E92 m-sport car which comes equipped with the same one-piece knob/boot perforated set up as the 335is cars.
i pulled off the stock knob with very little effort (Hulk genes) and started to install the BMW boot that i bought to go with the knob. damn! they sent me an E46 boot which does not fit! i'll get the correct boot and post pics later.
BMWCCA Member Since 1997
E30 M3 | E36 M3 Sedan | E46 330Ci | E39 540i M-Sport | E92 335i M-Sport | E90 335d M-Sport | 2013 E70 X5 50i M-Sport w/ Performance Package