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The problem is that no one has posted a dyno chart for a Zard slip-on with or without header work.jlzmeehan said:I would go with the slip on Zard and modify your existing header.From the posts I've seen you will end up with better results than a full aftermarket system.You will save some money too.Do a search and compare dyno charts.I'm pretty sure the info is out there.I was surprised.