AEM only makes an alternator pulley, no crank pulley (unorthodox racing makes one). I have an Auto GTS with the AEM alt. pulley. Throttle response was better after adding it, but you will not feel any hp increase. I only payed like $70 for it so I wasn't really dissapointed.
i got an AEM underdrive pulley from mb autosports...they took a while to ship it though, so you just gotta be patient... as far as the install...if you dont do it yourself, make sure the install shop does it right... the FIRST time they did it they didnt put the belt on right and my air con didnt work. just make sure, as with anything that its put in right
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