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Kooks has a system my ZL1 is over at R&D for new exhaust and headers.. if anything put headers on first then switch. I went with the MBRP Cat back with no headers and oh it was loud but not to loud. But for under 700.00 can’t beat it.... Sounds amazing over Stock, but no quite mode. My ZL1 has 4 settings from stealth to Track... I don’t want to loose the stealth or touring, Sport settings to Track as well wide open... I will let you know in a few weeks as estimate was 3 weeks because holiday.
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