| Only behind nitrous (which isn't all the time) and a turbo upgrade (which requires a motor pull). Still, talk to Greg who sells them (SpecialtyZ.com) or Mark who had them made (mleader@earthlink.net) about your car/situation before you purchase so you know what's involved.  
 www.SoCalZCrew.com - Come find out how we do it in the West!
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