Lingenfelter has been a great company for me so far. They endure my emails and calls almost every other day. I should hopefully have my car back from them this weekend to let you know how it is. The reputation was the big deciding factor for me. Hennessey seems like a decent company also but I have always associated them with Dodge and Lingenfelter with Chevy, even though I am sure they work on different cars.
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