Unless you are driving around with the tach at the upper end all the time, you won't notice a thing. Well, actually you will notice your lights dimming at night when at idle and the temperature guage reading hotter when in stop-and-go traffic. I thought they sucked (even had the March pulleys) so I tossed them long ago. With my current combo, I doubt they would make a difference. I now run the '93 Cobra crank pulley with the matching water pump pulley (which is SMALLER) to keep the coolant flowing. My 3G alternator also has the OEM '94 pulley. Just my $.02.
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