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Most people will tell you that it is not worth it, but for only 60 or so bucks, I wouldnt worry to much about being ripped off and just get it. It cant hurt right?
MD can you tell me why raising the powerband to higher rpms is a good thing? Wouldnt you want the powerband as soon as possible or is tehre more to it?
hp = torque x rpm (for the most part) ... so in a nutshell the more torque you have at higher rpms = more hp. Sometimes though this higher rpm power comes at the cost of reduced low end power, while this is good for max acceleration its a neg for normal driving.