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AEM are a very good quality cam gear. Some people have claimed that they can slip, but AEM has basically proven that if installed right, even one of its screwws will hold over 10,000rpm. Other people swear by Unorthodox and Skunk2. However, the AEMs are in my opinion just as nice.
As far as expected HP gains, on a stock engine you may see 2-5hp and tq. You do not need any other mod for these, although the more mods the better. I have personally seen a car being dyno tuned (H22A4) that got 10hp from cam gears. Although this is rare, it can happen.
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