ZPE makes the griptec stuff so you can just order right from them instead of paying a markup somewhere else:
https://www.zpegriptec.com/
I’ve had great luck with Dayco belts. The one time I didn’t use it, the belt broke FWIW. Many of theirs are American made too. But Gates is obviously great too.
Keep in mind most people see 1.0-1.5 pounds of additional boost going from a regular pulley to a griptec. Something to keep in mind if your fueling is on the edge.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)