I know a lot of people in my area who get them just to say that they have 'em. Also to say that they modified their stang. Every one of them has had to buy a new alternator. On a bone stock car, they do not make that much difference. Whey they make power is when you are turning higher rpms and have 15 other mods to go along with it. If you are hell bent on getting a set of pulleys get the stereo friendly set like JL1314 mentioned. I know $80 sounds like a cheap mod, but it will cost you in the long run. That is on a daily street driven car.
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The sig says it all.
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