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Russell - That would be SLP. They do have a high price mark, but they are just that. A partner with GM and you retain your warranty. I get my car back in a couple weeks from being tuned out by SLP to their ZL600 specs and I will retain my warranty to be used at any GM dealer.
I agree since the ZL1 has come out, they needed to add in a new flavor to keep things interesting. And it seems they are doing just that.
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