From the "Best Time" Thread in the Track Forums. Plenty of examples where ZL1s are NOT faster. Direct copy paste for your convenience. Bro.
Atlanta Motorsports Park - Dawsonville, GA
1. 1:28.67 - jpdaugherty in '17 SS 1LE on 10/21/18, OE SC3, track alignment Video
2. 1:31.87 - CasualGuy in '19 ZL1 1LE on 5/13/20, SC3 220TW (305/325), all stock Video
3. 1:36.35 - Deesiel678 in '18 V6 1LE on 4/3/19, RE71R in 255/285, track alignment Video
Autobahn Country Club - South Course - Joliet, IL
1. 1:33:00 - dvmluaces in '18 SS 1LE on 10/5/20, Pirelli slicks on 18" BBS wheels, track alignment Video
2. 1.33.35 - Junkyardspecial in '18 ZL1 1LE on 5/24/21, OE 3Rs, Rotofab intake, Soler TB, ARH Catless Headers, Corsa Exhaust, Carbon Fiber Brake lines, DTC70/60 Pads, Brembo HTC64 fluid, 93oct tune, Video
Barber Motorsports Park - Birmingham, AL
1. 1:34.08 - LG277 in SS 1LE on 305/680 PZero DH slicks, track pads, Video
2. 1:35.98 - Steelankles in '20 ZL1 1LE on 7/25/21, OEM SC3R, SRF brake fluid, Rotofab CAI, AWE axle back, Video
....and I only got to B. Go see for yourself
https://www.camaro6.com/forums/showthread.php?t=512725