Does a performance serpentine belt exist ? For example, something close to a Gates Racing Serpentine belt or equivalent?

 

I'm sure the OEM one is better. As for gates I've always had squeals after installing. This was on a GS400 though.

 

Yes, OEM is better as for the standard rubber compound, however the Gates Racing Belt is Kevlar infused but they don't make it for the IS250. I was wondering if any other name brands would make it with the Kevlar infusion since it last longer and doesn't stretch as much over time.

 

Everything but OEM squeals in Lexus/Toyota products... usually. Most of the serpentine belt squeals are overdue OEM or pretty new aftermarket.

 

I've read the Continental serpatine belt (rebranded, was called Goodyear Gatorback), were, and still are the best belts. They cost twice as much as the OEM Bando one on Amazon. Let me know what you chose as I am going to replace mine soon.