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Kooks is the only one that offers a LT/Cat package that supposedly does not require a tune due to the "green" option cats. otherwise it will pop a O2 sensor code sooner or later.
without a tune though you wont get the full benefit of the upgrade though.
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2013 2SS Dusk Edition
Lethal Racing Stage V
PER 418ci Forged LS3
530/520 SAE
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