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Not a ZL1, but Maggie equipped SS. Unless you guys are hell bent on going catless I would try reinstalling your factory NPP exhaust with LT headers and high flow or green cats. That's what I'm running and I think it sounds great, slightly louder than stock but no raspiness or drone. At last year's CamaroFest, I'll bet I got a dozen compliments on my idle exhaust tone. Guys couldn't believe it was the stock system.
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Baby Blue
2016 Hyper Blue 2SS/6m/MRC/NPP/Silver Rally stripes/ZL1 wheels & brakes/GForce DS and axles/ZLE Cradle Bushings/FE4 ARB front & rear/SEMA Grill/Rotofab dry/95mm TB/Magnuson 2300/Full LT4 fuel system/JMS boost-a-pump/E85 Sensor/Ported CID heads from LME/Cammotion PD cam/Thompson Motorsports forged shortblock/catted Kooks 1 7/8 headers /JRE remote tuned
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