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Here's the list of warranty friendly mods I did to my SS:
1. Cold air intake
2. Race scoop with windshield washer bottle relocation
3. Vmax ported throttle body
4. Cat back exhaust (didn't provide much in the way of performance, but it sure made the car sound better)
I was going to install a set of Solo high flow catalytic converters but ended up trading the SS in on a ZL1.
Since you have an L99, you can also install the Range AFM disable device.
Pretty much anything else beyond this list will require a tune and therefore loss of your powertrain warranty.
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