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Have you checked the ESS site lately (www.esstuning.com). If you will look under news, you will se that they are developing a Vortech supercharger kit with chip upgarde (check out the new E-46 kit). They will also offer a drivetrain warranty just like Dinan. It will be probably about $6,000 - much less than Dinan's $12,000.
By the way, what is the latest with a new larger Dinan throttle body.
Scott Myers