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I went with Whipple & saw a post where it adds about 75lbs., but with the new 2.9L supercharger it makes 585 RWHP on 91 octane & others that already have one are running mid 10's. You can use up to a 109mm throttle body for more power. Comes with 1 year limited warranty & optional 3 year/36,000 mile warranty.
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