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Message: <blockquote data-quote="Calvin Tan" data-source="post: 121275" data-attributes="member: 167">If you underdrive your a/c compressor you will be driving with a heater.I think most of you guys here are misunderstood the topic here. Breakpopin is asking for the underdrive pulleys means power steering, water pump and perhaps an alternator pulley if you want. That's it! no nothing fan clutch pulley, a/c compressor pulley  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />  or crankshaft pulley.The underdrive pulleys (I mean power steering pump and water pump pulley) is suppose to reduce the speed (yes, it turn slower). So it is more lighter and easier for the crank / crank pulley to turn them. So lesser burden to the crank, more power to the wheel.  In general a newer generation BMW (eg. E36 and above) are not proven with an underdrive crank pulley.P/S pulley and W/P pulley is good enough I have been using it for a month now. I was so sceptical for this pulleys stuff until have tried it out. My experience for this. More power on the wheel all the way from acceleration until max rpm cut ( they don't gain any engine hp, but give more wheel hp), much quicker throttle response... most important it worth every single penny.I'm now trying out a new product. See you all in another thread...bye now..</blockquote>