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Basically any package that requires a tune will throw the manufacturer warranty out the window, but these are honestly very stout cars. GM left about 200 WHP on the table with basic bolt-ons and a cam package. Our JDP ZL-850 packages are getting quite popular as well as our ZL-700 Package for those who don't want to get into the engine yet.
If you search around, you'll find many 700+ RWHP ZL1's on this site that get used and abused with no real problems. As long as you use quality parts and have a builder and tuner who knows what they're doing you shouldn't have any issues.
Best regards,
Tyler
888-308-6007
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