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Message: <blockquote data-quote="bfr" data-source="post: 1353754" data-attributes="member: 409"><p>Whipple tune is designed for stock vehicles.  It does not produce quite as much increase as an MPT tune.  Some owner's with additional modifications (downpipes, exhausts, etc) have gotten slightly different tunes but that is not a guarantee and certainly not what is marketed or sold.  The tune will adapt to varying octane but is designed for a minimum of 91 octane. It is not compatible with E85 which would require an upgraded tank fuel pump, fuel injectors, etc.  Whipple comes out with updated tunes from time to time and your brother will just need to contact them.  They will send him the file for free and he uses the Tomahawk to install.  If he did not get the Tomahawk or the former owner bought the tune back when you had to send in your PCM, he will have to either send in his PCM to receive the update or purchase the flash tool for about $300.  Having the latest tune is well worth the effort.</p></blockquote><p></p>