I got z-stab. Differences not very great but for the price I paid it was quite worth it. Supposed benefits are better FC and improve ICE. I don't have a good ICE setup right now so I can't vouch for it. But FC did increase marginally.
I'm not sure how much cause I haven't really been monitoring it. But for my 325Ci with normal spirited driving and 60% Highway and 40% Road driving I can get about 480 to 500km quite easily. If I drive more conservatively can squeeze quite abit more.
what about claims of smoother ride etc ? Actually, sounds quite interesting but kinda concerned if PML will bitch about should anything concern the electronics break down..
Smoother ride. I didn't really get any vibrations during idle before the installation. Doesn't affect pickup as much as I would like, but why would it.
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